9. Given below are four sentences. While three of them are correct, one is not acceptable in formal English as it is grammatically incorrect. Spot that sentence.
A. Up above us, two French climbers glanced beneath their legs.
B. They watched as the single rock which they had nudged off a ledge dislodged several other rocks, and those some others, and suddenly a gang of rocks of different sizes was leaping noisily off down the face.
C. They could not see properly whether there was anyone below them: a protruding hood of rock prevented them getting a full view of the face.
D. But it seemed unlikely that anyone would be coming on beneath them.