did or could

[belly_ttt]

From the time of their introduction, however, the problem of opening the cans ______ not detract from their wide acceptance as a solution to the problem of food preservation
a) could
b) did

What do you choose and how come?

 

[Shakespeare's brother]

Personally, I would choose 'did' for your example. 'Could' seems to me a little doubtful, whereas 'did' is a lot more definite and as such fits the context.