Decide if the following sentence is grammatically correct or incorrect.
voy a las comprar.

Me gusta autobus a. andar b. empezar c. tomar d. tener

In the diagram, which must be true for point d to be anorthocenter? o be, cf, and ag are angle bisectors. be 1 ac, ag 1 bc, and cf 1 ab. be bisects ac, cf bisects ab, and ag bisects bc. be is a perpendicular bisector of ac, cf is aperpendicular bisector of ab, and ag is a perpendicularbisector of bc.

Which form of the verb ir correctly completes this sentence?