5. The main purpose of "The Great Stink" is to

; whereas the main purpose of

"Toilets of the Future" is to

explain how flush toilets work; educate readers

about water-related diseases

® teach readers about cholera; introduce readers

to the tiger worm

© detail a sewage crisis that changed history:

spotlight possible solutions to today's

sanitation challenges

O caution readers about the possibility of a new

sewage crisis; convince readers to compost

Plsss help