If charlie's utility function where x^2a xb, the price of apples were pA, the price of bananas were pB, and his income were m, then Charlie's demand for apples would be:______.
a. 0.67m/pA.
b. 0.50pAm.
c. ml(pA + pB).
d. m/(2pA).
e. 1.50pBm/pA.