ANSWER THIS QUESTION

:)))

Iknow #2 is d. i just need to know why

In which of these cases are the two wave points considered to be in phase with each other?

What effect would average population growth have on land usage? a. urban use of land would rise to more than 30 percent of available land. b. industrial use of land would rise to more than 30 percent of available land. c. the percentage of available land used as cropland would stay the same. d. cropland would fall to about 10 percent of available land.