Which of the following is a true statement regarding culture?
a. cultures are fixed.
b. culture is inherited.
c. cultures do not change.
d. cultures are fluid.

Options a) and c) essentially say the same thing: that cultures do not change. But it's not true. Thing about how the smartphones are changing our culture now.

Culture is also not inherited as the children of immigrants often identify with the culture of their country and not the culture of their parents.

So the correct answer is d. Cultures are fluid.

Complementary goods. they go together, thats why one price increase and the others demand increases