comany announced that the price of the product

[tankobe]

this is a sentence revised from OG problem without changing the option.
The comany announced that the price of the products rise during the first month at a 7 percent, while the cost decreased when it might have been expected for it to rise.
B) it might have been expected to rise
(the original OG question can be find in forum if you just search this option B )
D) its rise might have been expected

Ron, you said D is wrong because it must parallel to the"cost"(in the context), but i think the real problem is what Verb when modify.
in B, when modify rise, when the rise happen is when the derease happen. (because have been expected is happen bofore decreased, when can not modify expected , making decreased and have been expect happen at the same. )
but in D, when can only modify have been expected, make no sence.

that is all my opinion. if i am wrong, please please inform me!!!!
i think the when clause--sb do1(such as 'require' and 'expect') sb to do2 is really defficult, since when can modify do1 or do2.

[RonPurewal]

Ron, you said D is wrong because it must parallel to the"cost"(in the context), but i think the real problem is what Verb when modify.
in B, when modify rise, when the rise happen is when the derease happen. (because have been expected is happen bofore decreased, when can not modify expected , making decreased and have been expect happen at the same. )
but in D, when can only modify have been expected, make no sence.

i'm not really following your argument, but there is another error - a usage error. you can't use "rise" as a noun, unless you're talking about the rise of something abstract (like "the rise of communism" or "the rise of Christianity").

if you're talking about the rising of something/someone physical, then you use "the rising": the rising of Jesus; the rising of the moon.

if you're talking about an increase in a statistical quantity (as we are here), then you can't use "rise of X" or "rising of X".
you can use "the rise IN x", but then you cannot turn this into a possessive (i.e., "x's rise" is incorrect here).

[tankobe]

i'm not really following your argument, but there is another error - a usage error. you can't use "rise" as a noun, unless you're talking about the rise of something abstract (like "the rise of communism" or "the rise of Christianity").

if you're talking about the rising of something/someone physical, then you use "the rising": the rising of Jesus; the rising of the moon.

if you're talking about an increase in a statistical quantity (as we are here), then you can't use "rise of X" or "rising of X".
you can use "the rise IN x", but then you cannot turn this into a possessive (i.e., "x's rise" is incorrect here).

all unexpected gains!! thank you, ron!