Option B
The product of five and the sum of a number x and three is twelve is 5(x + 3) = 12
Solution:
Given that we have to translate the following sentence into equation
Given sentence is:
The product of five and the sum of a number x and three is twelve
Let the number be "x"
By given sentence,
product of five and the sum of a number x and three = 12
"Product" means multiplication and "sum" means addition
So multiplication of five and sum of x and 3 is 12

Thus Option B is correct