Select the correct answer.
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
