Refer to Goods X and Y. How would a budget line be affected if income and both prices all simultaneously doubled?

Assume that good X is on the horizontal axis and good Y is on the vertical axis in the consumer-choice diagram. PX denotes the price of good X, PY is the price of good Y, and I is the consumer's income. Unless otherwise stated, the consumer's preferences are assumed to satisfy the standard assumptions.

a. It would shift out so that all quantities are doubled.
b. It would shift in so that all quantities are halved.
c. It would not be affected.
d. The slope would be doubled.

c. It would not be affected.