What is the driving force for the movement of air into the lungs?

i believe the correct answer from the choices listed above is the first option. the scientists need to look at the   validity of data, claims, hypotheses, and observations before  developing an argument. they base their arguments on facts that are present and they make sure they have proofs. 

explanation:

answer'(basidium)the spore--bearing structure of a basidiomycete is called a basidiocarp; ///