Suppose an individual's utility function is given by the following expression:

U(q1,q2)=2q1+q2

Assume that each unit of good #1 (q1) costs $5 (p1=5) and each unit of good #2 (q2) costs $3 (p2=3). Which of the following changes would cause the largest increase in the quantity demanded ofq1?

a) The price of good #2 increases by 3%

b) The individual's income increases by 2%

d) The price of good #1 decreases by 1%