Answer:
The correct answer option is C. 3.
Step-by-step explanation:
We are given the number '5.80' and we are to indicate the number of significant figures in the given measured number.
According to the rules of significant figures, numbers that are non-zero, zeros between any two significant numbers and the ending zeros in the decimal position are categorized as significant figures.
Therefore, the number 5.80 has 3 significant figures in it.