Answer:
A. The fifth sentence elaborates on an assertion made in the preceding sentence.
Step-by-step explanation:
Answer A
Correct. In the fourth sentence, the authors make a claim about the role of mathematics in the sciences, asserting that “the more [mathematics] can be applied usefully within a science, the more advanced the science.” The fifth sentence begins with the conjunction “For,” which is commonly used to introduce reasoning that explains or clarifies an earlier statement. And indeed, the fifth sentence does explain why the application of mathematics helps advance a science: because mathematics functions as both a precise language and a means of measurement.