The Arithmetic Average Return of 8,12,2,and 16 Per Cent Is $\times$

The arithmetic average return of 8,12,2,and 16 per cent is computed as:

A) the square root of (8 + 12 + 2 + 16)
B) the ¼ root of (8 + 12 + 2 + 16)
C) (8 + 12 + 2 + 16) $\times$ 4
D) (8 + 12 + 2 + 16) $\div$ 4
E) (8 + 12 + 2 + 16) $\div$ 2