Answer:

Explanation:
Given : A 3-pound tub of butter at n dollars per pound costs $3.85.
i.e. cost one pound butter is given to be 'n'.
Then the cost one pound butter must be expressed by '3n'. [By unitary method]
Also, it is given that the cost of 3 pound tub of butter is $3.85.
Then, the equation that most accurately depicts the word problem will be :

Hence, the correct answer is
.