Answer:
C. f(x)=|x|
Step-by-step explanation
Two straight lines denotes the mod which is a type of function which means it will always gives us a positive value (output) even on Nagative input, shown in the table, -2 2, -1 1, 0 0
For example,
|2|=2, |-2|=2
|1|=1
|-1|=1
The quotient of 12 and the product of 5 and t is:

The answer is A, the denominator should be 18.