Q1 - Braille is a method of producing text by means of raise

[bbox]

Can someone help me understand how to negate answer choice (B) Only people who currently use Braille as their sole medium for reading text will have the capacity to adapt to the use of the thermal screen. The word "only" is throwing me off.

The book has it as "people other than current Braille readers (to paraphrase) will be able to adapt to the thermal system.

[maryadkins]

To walk through this question for good measure, let's look at the core.

a new device will use the same symbol system as braille

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people who can read braille can adapt to it

Assumption: How do we know braille is just the same? Maybe they are different.

(A) isn't necessary. There can be other systems, but the screen is going to use braille, which we know already.

(B) puts a limit on the argument that isn't there. ONLY people? To negate this, you'd say, "NOT only people who currently use braille will be able to use the thermal screen." In other words, other people can use it, too. Is this necessary? No. The conclusion is about people who read braille.

(C) Bingo! It links the device to braille. If this weren't true, the argument would fall apart.

(D) and (E) are out of scope.