Ram cannot taste any difference between Coke (c) and Pepsi (p) and so he views one bottle of each as perfect substitutes.Which utility functions might reflects Ram's preference?

a.U(c,p)=c+p

b.U(c,p)= c+p

c.U(c,p)=2c+2p

d.U(c,p) = 2c+2p

e.U(c,p)=2c+p

f.U(c,p)=2c+p

g.U(c,p)=cp

h.U(c,p)= cp

4.Suppose Dana has a weekly budget of 10 dollars on Coke and Pepsi. Under what price conditions is it certain that Dana will buy only Coke?