Q1. The main idea in the write-up is:
A Making us learn that forgetfulness is inevitable. Correct
B Urging us to remember the things.
C Allowing us to be forgetful.
D Asking us to be more vigilant.
Explanation
The central point of the write-up is that forgetfulness is a natural and unavoidable part of how memory works. It does not chiefly urge constant remembering, because the passage treats forgetting as built into the system rather than as a simple failure of effort. It also does not give permission for careless forgetfulness; that would miss the explanatory tone. Being more vigilant may help in practical situations, but vigilance is not the main idea. The best summary is that the write-up helps readers understand why forgetfulness is inevitable.