Yo estoy en la tienda. (present)
Yo estuve en la tienda. (past)
Yo voy a estar en la tienda. (future)
Trabajadora. ........ you're welcome
This is how to conjugate the verb ESTAR (which means to be) in the present tense:
yo estoy, tu estás, el/ella/Usted está, nosotros estamos, vosotros estáis, ellos/ellas/Ustedes están.
Your sentence is I am home. In Spanish, the word YO stands for I in English. This means that you would use the form estoy in your example.
The correct answer is B. estoy.
Amigo- is a word used in Spanish for friend, which is supposedly used in English also meaning for friend. However when someone who speaks English uses the word Amigo they use it more like slang. In Spanish Amigo is friend, and compañera/o means more of an acquaintance. There is also colega which means colleague, compadre can also be used as spanish slang for friend. Amigote is another word for Amigo.