15. Three stocks A, B and C have initial prices of $12, $24, and $36. The return of stock A over the next year is 4%. The equally-weighted return of an index that includes only these stocks is 4%. The price-weighted return of the index ______

A. has to be greater than 4%

B. has to be less than 4%

C. has to be equal to 4%

D. can be greater than, less than or equal to 4% (correct)

NEED DETAILED EXPLANATION PLS