**PLEASE HELP** A teacher asked students to determine which of two investment options is best if the initial investment for both options is 500 dollars. Option A yields 5% compound interest, whereas option B yields 10% simple interest. The students conclusions are listed below.

I. Brian concludes that option A will be best for a short investment period. But option B will be best for a long investment period.
II. Edward concludes that option A is always a better option
III. Mark concludes that option b is always a better option
IV. Robert concludes that option b will be best for short investment period. But Option a will be best for a long investment.

whose conclusion is correct? ​