There was no doubt that their work was through.
Which of the words below is closest in meaning to the underlined word above?
The sentence shows the work is completed without a doubt.
so, these words can't replace 'through', here.
the word 'pretty' doesn't fit in this sentence.
so, Option "B." Complete is the correct choice.
@Naveen Kumar 3
Actually, None of these should be the answer
B would be answer if it would have been thorough not through