Communicable diseases can be prevented by: a) eating healthy b) keeping a clean kitchen c) not smoking d) both a and b

B) Keeping a clean kitchen.

Communicable diseases are diseases spread by germs. Cleaning your kitchen will help prevent the spread of germs when preparing meals.

so they can defeat there oppenent

hello!

according to the passage the most suitable options are two. the first one is "by leading the aef to victory in several key battles" like the battle of saint- mihiel and the battle of cantigny mentioned in the passage you copied here. the second one is "by the aef and allied forces defeat germany" since the passage says that his army destroy the german resistance in the meuse- argonne offensive. and also, "by insisting that the aef operate as an independent force".

hope this