Since 3 can go into 6 2 times, and 5 can go into 15 3 times, they are not equivalent. In order to have an equivalent fraction, you have to multiply or divide the numerator and denominator by the same number in order to check if they are equivalent.
Option C is the correct answer as SAS stands for Side, Angle, Side. You would need one side, one angle and another side to be the same for the conditions for congruency to be met.
