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In the following questions, a sentence is written in four different ways. Choose the option which gives the most effective and grammatically correct sentence. Pay attention to grammar, word choice and sentence construction.
They watched. They wondered. They were unable to find the reason.

A. They watched and wondered till they were unable to find the reason.

B. They watched and wondered but were unable to find the reason.

C. They had watched and wondered but were unable to find the reason.

D. They watched and wondered despite being unable to find the reason.

Please do not use chat terms. Example: avoid using "grt" instead of "great".