austin spends all his income on food (f) and shelter (s). his budget line is given by the equation 5f 20s = 100. which of the following consumption bundles is part of his consumption possibilities?
a. 8 units of F and 3 units of S
b. 14 units of F and 2 units of S
c. 0 units of F and 6 units of S
d. 20 units of F and 15 units of S