We have the equation:

So we need to get both of the terms to have a common denominator. We can do this by multiplying both the numerator and denominator of the first term by 2 - this allows it to remain the same number, it just increases the value of the denominator:

So then we can rewrite the expression:

And then we can add these fractions:

Therefore, the answer would be D)

**Note: These answer could further be simplified to
by dividing both the numerator and denominator by 3, however the answer choice is not there - for future reference though, you could further reduce.