ANSWER
The correct answer is D.
Step-by-step explanation
The given equation is

Let us tackle the one in the bracket first,which is

We can write this in words as the sum of a number and 3.
Now,

becomes, 6 times the sum of a number and 3.
Finally the complete equation,

becomes;
Six times the sum of a number and 3 is 42.
Therefore the correct answer is option D.