Question

1. which choice completes the text with the most logical transition? according to portuguese researcher isabel c.f.r. ferreira, the syringic acid found in almond mushrooms can protect human cells from damage. ______ the acid combats free radicals, a type of unstable molecule that can harm healthy cells in the human body. a. by contrast, b. thus, c. to be exact,

Explanation:

The first - sentence states that syringic acid can protect human cells. The second sentence explains how it does so (by combating free - radicals). "To be exact" is used to give a more precise explanation, which is appropriate here. "By contrast" shows a difference, which is not the case. "Thus" implies a cause - and - effect relationship where the second statement is a result of the first, but here the second statement is an elaboration, not a result.

Answer:

C. To be exact