We can actually deduce here that the third paragraph refines the author's claim about the new spacesuit in the following way:
A. It explains how new materials were used in the design of the new spacesuit.
An author's claim refers to the statement an author makes which he further validates with an evidence. Claims can be opposed by counterclaims.
The options that complete the question are:
A. It explains how new materials were used in the design of the new spacesuit.
B. It explains why astronauts were traveling to the Moon.
C. It explains the flaws in the old spacesuit design.
D. It explains how the new design accommodated astronauts walking on the Moon
Thus, we can see here that the third paragraph explains how new materials were used in the design of the new spacesuit.
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