Which of the following has the highest number of significant figures ?

Options

A. `0.007 m^(2)`
B. `.64xx10^(24)kg`
C. `0.0006032 m^(2)`
D. `6.3200 J`

Explanation

According to the rules of significant figures 0.007 `m^(2)` has one significant figures.
`2.64xx10^(24)`kg has three significant figures.
`0.0006032 m^(2)` has four significant figures.
`6.3200j` has five significant figures.