Axis:
Es la segunda vértebra cervical, presenta un agujero vertebral triangular.
#HopeThisHepls
Chica is feminine... reservada is feminine... so which of your options are feminine? Ella and la. Ella means she so it can't work, as that would mean she girl is very reserved. La is the femenine the. So that is your answer.
the answer is C, Corremos.
Hope this helps :)