Chemistry · Some Basic Concepts of Chemistry

According to the convention for rounding off numbers, if the rightmost digit to be removed is \( 5 \), followed by no other digits, which of the following pairs are correctly rounded off to two significant figures?

1. A
   \( 6.35 \rightarrow 6.3 \) and \( 6.25 \rightarrow 6.3 \)
2. B
   \( 6.35 \rightarrow 6.3 \) and \( 6.25 \rightarrow 6.2 \)
3. C
   \( 6.35 \rightarrow 6.4 \) and \( 6.25 \rightarrow 6.3 \)
4. D
   \( 6.35 \rightarrow 6.4 \) and \( 6.25 \rightarrow 6.2 \)