Option A is correct.
Okay, let's look at the answers after reviewing the table to see which ones we can eliminate. Right off the bat I see we can eliminate answer B because during week 2 Tori does NOT have exactly $15 more in savings.
Option C is also untrue because in week 1 5 * 15 is NOT 20.
Option D is incorrect because Martin's savings go up by 5 per week, and Tori's go up by 20 per week, so in Week 5 they would have $100 and $30.
Option A is correct because if you multiply Martin's savings each week by 4, they always equal Tori's corresponding savings.
$5 * 4 = $20
$10 * 4 = $40
and so on.
Hope this helped.