round off 0.440 ml to two significant figures.

Explanation:

Step1: Identify significant - figure rules

Non - zero digits are always significant.

Step2: Round the number

For 0.440, to two significant figures, we look at the third digit. Since it is 0 (less than 5), we drop it. The number becomes 0.44.

Answer:

D. 0.44 mL