A grammatical question
To plant rice, farmers, _____, set young plants in the mud.
A. whose bare feet wading in the water
B. wading in the water in their bare feet

Why is A incorrect?

Thank you for your help :)

Question

A grammatical question
To plant rice, farmers, _____, set young plants in the mud.
A. whose bare feet wading in the water
B. wading in the water in their bare feet

Why is A incorrect?

Thank you for your help :)

Answer

B is the correct answer.

The person (farmer) is walking (wading) in water, when partially immersed in his bare feet.

Answer

"A" is incorrect because the farmer is wading, not his feet.
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By the way, your title should be "a grammar question," that is, a question regarding grammar. A "grammatical question" is just a question that is phrased in a grammatically correct way, which yours was, so the title is not technically "wrong," but I'm fairly sure it's not what you meant.  ;)

Answer

I believe that A would be incorrect because wading should be wade in order to make sense.