Choose the correct option. Why ... you ... the meat? Is

Why are you smelling the meat? Is it bad?

We use Present Continuous here. Present Continuous is used for actions that take place at the moment of speech. Present Continuous is formed with the help of the auxiliary verb to be (am, is, are). We use am for the first person singular, is for the third person singular and are for plural. We add the suffix - ing to the verb. Negative is formed with the help of not to be + not + verb + ing. 

Interrogative am / is / are + subject + verb + ing.