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Since the sentence is correct W.R.T faulty reference.
So option D is the right answer
The answer is their. Their is when something belongs to them.
They're: They are
There: Over THERE
Their: belongs to someone
Answer is D
Was studying
Raised
Drove
Saw
Walked
Turned
Saw
Came
Heard
Was watching tv-arrived
When
While
Ourselves
Themselfs
Ourself
unsure about the last because I can't see the options but Sometime sounds right
Is this a multiple choice?