The sentence that displays the correct usage and meaning of the word 'loiter' would be:
A). The boy wanted to loiter near the library to see if the girl he liked would show up.
The meaning that the word 'loiter' communicates is "to have a stroll or walk somewhere idly or without having an aim or purpose to serve."
In the first sentence, the boy keeps 'loitering' around the library in order to just have a glance of the girl he liked.'
Thus, this serves the meaning of roaming idly most effectively and clearly, and hence, option A is correct.
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