The value of the constant of variation is one-fourth. Then the correct option is A.
The term "constant of variation" refers to the fact that the relationship between variables remains constant.
The formula will be
y = kx
where k is the variation constant.
When f = 2 and g = 8, n = 4. if n varies jointly with f and g, then the equation will be
n = kgf
Then the value of k will be
4 = (2)(8)k
k = 1/4
More about the constant of variation link is given below.
https://brainly.com/question/14254277