How many moles of magnesium phosphate, $$Mg_3(PO_4)_2$$ will contain $$0.25$$ mole of oxygen atoms?

A

0.02

B

$$3.125 \times 10^{-2}$$

C

$$1.25 \times 10^{-2}$$

D

$$2.5 \times 10^{-2}$$