Answer:
Opt C.
Step-by-step explanation:
The coefficient is a numerical constant placed before the variable, very often the coefficient stands out by its own (coefficient of n in opts A, B, D), but sometimes is hidden from view, because it is a mathematical convention not to show it, this happens when dealing with 0 and with 1,
as you can see in Opt C, the coefficient is not shown, but is there and it is hidden from view
