Help i'll give brainliest! help with 15 just make the answer clear please (PLEASE COMMENT IF YOU CAN"T SEE THE PICTURE DONT ANSWER!)

What produces wave a)sound b) heats c)transfer of energy d)vibrations

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.

What type of context clue you understand the meaning of  quandary?