Answer Explanation

@Julie, The passage tells us that reports of secondary events became so common that they are too numerous for all of them to be accurate (lines 37-39). The author then states that at most, we could observe one secondary event per every one hundred primary occultations assuming an ideal scenario where every asteroid has as many satellites as possible (lines 40-43). Since the reports are too numerous to be accurate, we can infer that the reports are more frequent than the highest plausible number of 1 per 100 primary occultations (D). (A) and (C) are incorrect because the passage only tells us that the secondary occultations became more commonly reported but we cannot infer the magnitude of the increase in the frequency of reporting. Let me know if you have any further questions.