The following questions consist of a sentence. Four of the words of the sentences are marked in bold, which may or may not be correctly spelt. Option corresponding to misspelt word is your answer. If there is no misspelt word in the sentence then choose 'No error' as your answer.
They improved(A) drammatically(B) once the lead(C) singer left(D).

Options

A. A
B. B
C. C
D. D