The correct option is A To provide further evidence of the systematic variation in the characteristics of Jupiter's four largest moons
Option A)To provide further evidence of the systematic variation in the characteristics of Jupiter's four largest moons is correct as the second paragraph talk about the findings which act as evidences to prove the discussed theory right. The other options are wrong as the theory is already given in the first paragraph, its significance is not discussed in the paragraph, facts that oppose, or to contrast any theory.