Answer
(d) sodium
Work Step by Step
While sodium is an important element in the body, Carbon, Hydrogen, Oxygen, and Nitrogen are the four major elements contributing to body mass.
Here are the approximate percentages of body mass for these elements:
Carbon: 18.5%
Hydrogen: 9.5%
Oxygen: 65.0%
Nitrogen: 3.2%
These make up a lot more of the body mass than sodium, which is approximately .2% of the body's mass.
