What Is the Mass of Exactly 1 Million Helium Atoms $4.00 \mathrm{u}$

Multiple Choice

What is the mass of exactly 1 million helium atoms? The atomic mass of helium is $4.00 \mathrm{u}$ .

A) $6.6 \times 10^{-21} \mathrm{~kg}$
B) $6.0 \times 10^{-17} \mathrm{~kg}$
C) $6.6 \times 10^{-18} \mathrm{~kg}$
D) $6.0 \times 10^{-20} \mathrm{~kg}$