¿cómo usted, profesora?
 muy bien, gracias.

D. está

Explanation: "Está" is a more formal word when talking to those older than you, and shows more respect towards that person.

Answers A, B, and C, would not make sense in the Spanish language for this conversation.

read the following texts. text 1 electoral marketing consists of implementing integrated political marketing and social communication techniques, in order to gain the approval and sympathy of the society, building a solid image of the candidate and being able to transmit reliability and safety to the population by raising its concept at the level of public opinion. therefore, electoral marketing is concerned with the formation of the image in the short term. catarin, roberto bianchi. electoral propaganda in media democracy: the victory of emotion in the 2014 presidential election in brazil. 2016. dissertation (masters in communication) - school of communication, education and humanities, methodist university of são paulo, são paulo, 2016 (158 p.)