Could be seen OR were being seen

Hundreds of sailing boats ................ from the beach yesterday. They looked really lovely.

 

a) can be seen   b) are seen   c) could be seen   d) were being seen

 

I think, (c) is the correct answer. However, I don't know why (d) isn't suitable. What do you think?

 

* This question is taken from a book called "The Best".

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