Giving Brainliest if right!!

Mary is planning to buy a mobile phone that costs $500. She can choose any of five different payment plans with varying simple interest rates and periods:

plan 1: 6% for 10 months
plan 2: 8% for 12 months
plan 3: 10% for 14 months
plan 4: 12% for 18 months
plan 5: 14% for 12 months

Which plan offers the lowest monthly payments?

A. Plan 1
B. Plan 2
C. Plan 3
D. Plan 4
E. Plan 5