Which revision best reduces the wordiness of this sentence? The teacher, who was inspiring, taught the student how to think creatively.

A .The inspiring teacher taught the student how to think creatively.

B .The teacher who was inspiring taught the student how to think creatively.

C .The teacher taught the student how to think creatively and how to inspire.

D .The teacher, who taught the student how to think creatively, was inspiring.

I think the answer is A

Explanation:

It shortens the sentence but still says the exact same thing

the present continuous is a verb tense which is mainly used to indicates that an action is in progress at the moment of speaking.  

it is formed using: person + verb to be (am/is/are) +verb + - ing form  

example: i am studying at this moment .

in addition, the present continuous is also used in order to express things that will or will not happen in the near future.

example: i am having dinner with some friends tonight.

the speaker sometimes   uses it   to express that an action is repeated and it causes irritation on the part of the speaker

example: my sister is constantly complaining about everything.