1.

1). Only I2). I and III3). I and II4). I, II and III

Answer»

In case of the first word, it should mean 'believed'.

bemused - puzzled, confused, or bewildered.

presumed - to believe or suppose that something is the case 

So, I requires a correction.

In case of the second word, it should mean 'fell down'.

plummeted - fall or drop straight down at high speed.

plonked - SIT down heavily and without ceremony.

So, II does not require a correction.

In case of the third word, it should relate to falling down a 'steep' icy something.

range - a line or series of mountains or hills.

ravine- a deep, narrow GORGE with steep sides.

Falling down a 'ravine' makes the sentence more meaningful than falling down a 'range'.

So, III requires a correction.

Therefore, the correct ANSWER is option 2.



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