One Critical Economic Difference Between a Firm and a Household

One critical economic difference between a firm and a household is:

A) Firms look for profit in their cash transactions,households rarely do.
B) Firms have no obligations to the communities in which they are found;households have many.
C) Firms may grow with relative ease,but the structure of households limits their growth.
D) Firms may expand their size through hiring new members but the membership of a household is fixed.
E) Firms usually behave in a manner that is economically rational,households rarely do.