1.

1). Only B2). Only A3). Both B and C4). Both A and D

Answer»

The sentence USES the form 'again a panel of', which is incorrect and needs improvement.

The preposition 'again' means 'more than once', which is incorrect here. The correct preposition here MUST be 'against', which means 'opposite'.

The only alternative that IMPROVES the sentence is B.

None of the other alternatives can MAKE the sentence meaningful.

Therefore, the correct answer is option 1.



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