The following question has a sentence with three parts marked as (a), (b), (c). Read each sentence part to determine whether there is any error in any part and indicate your response against the corresponding letter, i.e., (a) or (b) or (c). If you find no error, your response should be indicated as (d).
a: Economics is the science which studies
b: human behavior as a relationship between
c: ends and scarce means which has alternative uses