A car battery was kept for charging and after getting fully charged density of the battery acid $$H_2SO_4$$ was measured and found to be $$1.28\ \text{g cm}^{-3}$$. If initial molarity of battery acid was $$4.2\ \text{M}$$ then mass percentage will be around

A

$$28\%$$

B

$$30\%$$

C

$$32\%$$

D

$$34\%$$