Which of the Following Is an Implicit Cost? (I) the Owner

Which of the following is an implicit cost? (i) the owner of a firm forgoing an opportunity to earn a large salary working for a Wall Street brokerage firm
(ii) interest paid on the firm's debt
(iii) rent paid by the firm to lease office space

A) (ii) and (iii)
B) (i) and (iii)
C) (i) only
D) (iii) only