The passage mentions which of the following as a reason that neutrinos are hard to detect?
The infrequency of their interaction with other matter
The second paragraph starts with a question "But how can scientists detect a particle that interacts so infrequently with other matter?” Therefore, it can be gauged from the passage that neutrinos are hard to detect because of the infrequency of their interaction with other matter. Therefore, answer option (e) is the correct answer choice