Question

(Usted) Piensa en irse.

Answer 1

A. Piensa en irse because usted form is know as the polite form therefore ar- verbs such as pensar (ie) in the ud form will take a endings. The answer could have not been piensas because tgat would have been tú form

Answer 2

I believe it’s A it makes the most sense !! Hope it helpss