Answer:
Option C is correct


Explanation:
Here, x represents Kathryn's score and y represents Michael's score.
As per the statement:
Michael and Kathryn bowl together and their combined total score for one game was 425 points.
⇒

It is also given that Michael's score was 70 less than twice Kathryn's.
⇒

Therefore, the system of equations models the problem is:

