Correct answer: 2

In this question, we are comparing the kinetic energy of two objects, X and Y.

We are given that X is twice as massive as Y. This means that the mass of X is twice the mass of Y.

We are also given that X runs twice as fast as Y. Since kinetic energy is directly proportional to the square of velocity, this means that the velocity of X is squared when calculating kinetic energy.

From these two pieces of information, we can conclude that the kinetic energy of X is given by (2^2) = 4 times the kinetic energy of Y. In other words, the ratio of kinetic energy of X to Y is 4:1.

Therefore, the correct answer is option 3, which states the ratio as 4:1.

Alert - correct answer should be option 3: 4:1.