Scientists have discovered a subterranean aquifer ---- volume exceeds that of several major surface reservoirs combined.
Answer and explanation
Correct answer: C. whose
- Step 1: The relative clause describes the possessive relationship ('the volume of the aquifer').
- Step 2: 'Whose' is the possessive relative pronoun modifying 'volume'.
Answer
whose.
Why not the others: 'which' cannot express possession without 'of which'; 'where' denotes location; 'that' cannot indicate possessive relationship.
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