The square root of 3 (b). The reason why is because it cannot be shown as the ratio of two numbers. You can find out more here: https://www.khanacademy.org/math/algebra/rational-and-irrational-numbers/alg-1-irrational-numbers/v/...
If you have completed questions, you still have more questions to answer. We need to find what fraction is of , if that makes sense. A fraction is simply a part over a whole. In this case, the part is and the whole is . Therefore, the fraction we are looking for is , which simplifies to . Hope this helps!