Final answer:
The maximum number of jeans and shirts Harriet could purchase is 5 jeans and 10 shirts (option b).
Step-by-step explanation:
In order to determine the maximum number of jeans and shirts Harriet could purchase, we need to compare the quantities of jeans and shirts given in the options. The maximum number of jeans and shirts Harriet could purchase would be the smaller quantity mentioned in the given options.
Out of the given options, the maximum number of jeans and shirts Harriet could purchase is 5 jeans and 10 shirts (option b). This is because option b has the smallest quantity for jeans compared to the other options.