The sum of -7pq and 2pq is

The addition is as follows:

⇒ -7pq + 2pq

=pq(-7 +2)

=pq(-5)

= (-5pq)

⇒ Result is as follows: (-5pq)

Option (a) does not match to our solution.

Option (b) does not match to our solution.

Option (c) does not match to our solution.

Option (d) does match to our solution.

So, option (d) is correct answer.