Concept: The word
averse means having a strong dislike or opposition to something.
Explanation:The sentence begins with "Though", which shows a contrast between the teachers' action and the principal's feeling.
If the principal was
averse to the idea, the teachers must have reacted in the opposite way — they approved of it or received it gladly.
Among the options,
welcomed means to accept or receive with pleasure, which is the direct opposite of
averse.
The other words — recognised, admitted, and greeted — do not strongly express the opposite of strong dislike or opposition.
Thus, the correct word to fill the gap is
welcomed.
Answer: A. welcomed