Final answer:
The chemical symbol for molybdenum is Mo, as seen in the compound molybdenum trioxide (MoO₃). The answer is option c.
Step-by-step explanation:
The chemical symbol for molybdenum is Mo. This can be confirmed by looking at the periodic table or in chemical formulas of compounds containing this element, such as molybdenum trioxide (MoO3). Therefore, from the given options, the correct choice for the chemical symbol for molybdenum is c. Mo.