Which of the following substances contain protein?
a.
sodium chloride (table salt)
c.
both a & b
b.
sodium bicarbonate (baking soda)
d.
neither a nor b

D, sodium chloride is just NaCl (no protein) and sodium bicarbonate is just NaHCO3 ( no protein). Proteins are very large macro molecules and contain a backbone consisting of N-C-C subunits. 

The best and most correct answer among the choices provided by your question is the fourth choice or letter D.

Neither salt nor baking soda contains protein.

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The correct answer is "b"