Assume the following expression summarizes an individual's demand for good #1:

q^d₁ (p₁, p₂ , y) = 10 p₁ + 2p₂ y

Currently, the individual's available income is $10 (y=10), the price of good #1 is $8 (p₁=8), and the price of good #2 is $5 (p₂=5). Which one of the changes below would cause the largest increase in the individual's consumption of good #1?

a.) The price of good #1 increases by 1%

b.) The individual's income falls by 1%

c.) The price of good #1 falls by 1%

d.) The price of good #2 falls by 1%