Examples Of Complementary Things Help With This One Question?

Help with this one question? - examples of complementary things

37, ceteris paribus, the demand for real estate rather inelastic,
a. unless the replacement.
b. and the period.
c. Rather, it is a luxury.
d. smaller market for good
A possible example of complementary products for most people
a. hamburgers and hot dogs.
b. Lawnmowers and cars.
c. Burgers and fries.
d. Dr. Pepper and Pepsi.

A possible example for a replacement for most people
a. Peanut butter and jam.
b. Tennis balls and tennis racquets.
c. TV and subscription TV services via cable.
d. pencils and pens.