Of the Following, __________ Is the Smallest Mass

Multiple Choice

Of the following, __________ is the smallest mass.

A) 25 kg
B) 2.5 × 10^-2 mg
C) 2.5 × 10¹⁵ pg
D) 2.5 × 10⁹ fg
E) 2.5 × 10¹⁰ ng