Choose the letter A, B, C or D to indicate the underlined part that needs correction

Choose the letter A, B, C or D to indicate the underlined part that needs correction.

43. Both(A) Lan and(B) Mai is interested in(C) reading short(D) stories. 

44. What(A) about using(B) buses public(C) instead of motorbikes to reduce(D) exhaust fume? 

45. After(A) she prepared(B) meals for(C) her children, she went(D) to work.