Mary Sanders was a successful artist.
Before she died, ---
a) she could do practice
b) she had better take photos
c) she has won several awards
d) she could draw many pictures
The answer is supposedly d) but I have serious doubts. First of all "she could draw many pictures" may have various meanings. In order to be the correct answer we have to take for granted that "could" is here the past tense of can. On the other hand, "could" may also refer to the present and the future. We can read the sentence also as; "Before she died, she might draw many pictures" (as a suggestion). In this case the sentence would be incorrect because it would be irrelevant with the beginning sentence "Mary Sanders was a successful artist." It would sound as if we suggested her to draw pictures before she died and the sentence would be absurd. I think that neither of the choices are correct or could we say that c), althouh looking grammatically incorrect, may be true hence a person might continue winning awards after her death. "Before she died she has won several awards and she still does"(which would fit the "having a conneciton with the present" rule of the Present Perfect Tense.) I think that it is confusing to put a sentence which conveys more than one meaning as a choice.