Why could two index funds that have the objective to track the S&P 500 index have different return performance?

i. Different replication strategy

ii. Closet indexing

iii. Differences in expense ratios

iv. Transaction cost variation

v. Different sales commissions

vi. Style drift

A) i, ii, & iv

B) i., iii, iv, & v

C) All are correct

D) iii, iv, & v

E) iii & iv