In the following question, four alternatives are given for the idiom/phrase in bold and italics in the sentence. Choose the alternative which best expresses the meaning of idiom/phrase.
The class could not keep a straight face on hearing the strange pronunciation of the new teacher.
A.
remain silent
B.
remain serious
C.
remain mute
D.
remain disturbed
Correct answer is B
No explanation has been provided for this answer.
