In each of the following sentences, there is one word underlined and one gap. From the list of words lettered A – D, choose the word that is most nearly opposite in meaning to the underlined word and that will, at the same time, correctly fill the gap in the sentences.
The school authorities expected the contributions to be …………..rather than compulsory.
The correct answer is: B
Explanation
The sentence talks about contributions that are expected to be made without being forced. The opposite of "compulsory" is "voluntary".