Choose the letter A, B, C or D to complete the sentences with given words
When/ mother/ come in/ I/ reading/ brochure.
A. When my mother came in, I am reading a brochure.
B. When my mother came in, I was reading brochure.
C. When mother came in, I was reading a brochure.
D. When my mother came in, I was reading a brochure.