In continuous sentence how to determine whether to use 'and'

[do-OR-die]

The filibuster, a parliamentary device that slows the snail’s pace that prevails even in the best of times in congressional sessions and tests the endurance of everyone associated with it, seems more and more an anachronism in the age of telecommunications.
(A) sessions and tests the endurance of everyone associated with it, seems
(B) sessions and tests the endurance of everyone who is associated with it, seeming to be
(C) sessions, tests the endurance of everyone associated with it, seems
(D) sessions, that tests the endurance of everyone associated with it and seems
(E) sessions, testing the endurance of everyone associated with it and seeming



i FEEL THE answer to be C ? cud anyone please explain if I am wrong ! I am confused with A and C .. THe 'and ' in A is it needed in this sentence

[RonPurewal]

hi - if you're going to post questions in this folder, you must post the source for each one; otherwise, we'll have to delete the threads. (see the sticky for the appropriate rules, and for the list of banned sources.)
thanks.

by the way, please spell out words such as 'could'; abbreviations such as 'cud' make posts harder to read. thanks.