please provide detailed explanation of each point

Reshad's preferences over goods 1 and 2 are given by the following utility function; 1 U(q1, 92) - 91 1 + 92 Reshad's income is $80 and the prices are given by p,-1 and p2-5. Select all that applies: a) Marginal rate of substitution for his preferences is given by MRS12 92 91 b) When he consumes zero amount of good 2, his MRS12 is equal to 1 c) It is optimal for him to consume 80 units of good 1 d) It is optimal for him to consume 16 units of good 2 (e) If the price of good 1 doubles, he will increase his consumption of good 2. O f) none of the above