The number of significant figures in 0.06900 is

The correct option is 4.

To determine the number of significant figures in the number 0.06900, we apply the standard rules for identifying significant digits:
1. Leading Zeros: Zeros that appear before the first non-zero digit serve only to position the decimal point. They are never significant. In 0.06900, the zero before the decimal point and the first zero after the decimal point are leading zeros, and thus are not significant.
2. Non-zero Digits: All non-zero digits (1 through 9) are always significant. In this number, the digits 6 and 9 are significant.
3. Trailing Zeros: Zeros at the end of a number and to the right of the decimal point are significant because they indicate the precision of the measurement. In 0.06900, the two zeros following the 9 are trailing zeros in a decimal, so they are significant.

By identifying the significant digits, we can highlight them as follows: 0.06900.

Counting these highlighted digits (6, 9, 0, and 0) gives a total of 4 significant figures.