Which of the following statements is true regarding home production?
a. There is a set definition of home production activities used to quantify the economic contribution provided by the activities
b. Women's investment in home production has increased over the past 25 years It is difficult to define all of the activities that are involved in home production
c. Home production can be defined as any paid activity that takes place in the home
d. Home production activities have the same economic value from household to household