Always remember this: The PRESENT PROGRESSIVE TENSE indicates continuing action something going on now. This tense is formed with the helping "to be" Verb , in the present tense plus, the present particle of the Verb (which ends with an -ing): For example :
I am buying all my family's Christmas gifts early this year.
I hoped this helped :)
I say it's A. because everything else has a mistake.
I cannot really answer that because it does not give much detail. What paragraph?
