You can use Alan P.'s method or this method; they are both equally valid.
Remember that when you add fractions, you should find a common denominator. Luckily, these fractions all have the same denominator already—
The next step is simply to combine the fractions by keeping the denominator the same and taking all the numerators and adding them up in the numerator of the combined fraction.
Next, realize that
Now, since a fraction represents division, notice that the
So the answer is A.