Margo has a daily income of $60, which she can spend on coffee or bagels. Each cup of coffee costs $3 and each bagel costs $4. She is currently spending all her income, and she is willing to forgo 1 bagel to get the next cup of coffee to achieve the same level of utility. To maximize her utility, she should:_______.
a. increase bagel consumption and decrease coffee consumption
b. decrease both consumption of coffee and bagel
c. do nothing
d. increase coffee consumption and decrease bagel consumption