From the sentence we gather that :
1. interview happened last month (past)
2. rebels estimated two things during that - x&y
Since the sentence talks about something was estimated in an interview in the past - use of 'had been' is required
As estimation is of two things, parallelism is to be maintained - estimated THAT x & THAT y
Only option D fulfills both these requirements. Hence D must be the answer.
1. interview happened last month (past)
2. rebels estimated two things during that - x&y
Since the sentence talks about something was estimated in an interview in the past - use of 'had been' is required
As estimation is of two things, parallelism is to be maintained - estimated THAT x & THAT y
Only option D fulfills both these requirements. Hence D must be the answer.
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