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In each of the following sentences, a preposition is...

In each of the following sentences, a preposition is missing.


As he is an elderly man, he has a difficulty ________ using the computer.

This is a simple method ________ searching suitable solutions.

She was in trouble _________ robbing a car.


The alternative that respectively brings the correct preposition for each one is


A

of / in / for


B

about / by / for


C

in / of / for


D

of / of / when


E

in / on / by