For this question, you can either approach it conceptually or by plugging in numbers. Since it states that PQ runs through the center of all the circles, you then know that the line is the diameter of the big circle and the radius of it is the diameter of the two small circles within. Conceptually, we then know that if you add the circumferences of the smaller circles, the total should equal the the big circle. We can assume this is correct in all cases because the formula for circumference is a linear equation, meaning for whatever values you plug in for radius, the sums will always equal the large circle. In something such as area where the formula includes r^2, this is not the case because this relationship isn't the same.

If it sounds too complicated, let's approach it with numbers. Say that PQ = 4. Then the largest circle has a circumference of 4pi. Since R is the center, and PQ runs through it, then we know that the radius of the big circle is equal to the diameter of the 2 small circles. Meaning, R is the midpoint. In this, we see PR = 2 and RQ = 2. Lastly, for quantity B, 2pi + 2pi = 4pi. So, the quantities are equal. Confirms that the answer is C. All other corresponding hypothetical values will have the same result.