Question

Boyd takes additional measurements of the mass of product formed in a reaction. he uses a balance that has smaller graduations than the first balance he used.

Answer 1

B. He is trying to increase his precision but not his accuracy.

Answer 2

I think that the question is: "what is the purpose of Boyd's addittional measurement, what does he want to improve".

The answer to this is that he wants to improve the precision (by the virtue of making a repeated measurements and by the virtue of those measurements being closer to the actual value)