Verbs ending in -ir that undergo stem changes in the present tense also under go stem changes in the preterite. These verbs have a stem change in the second person formal singular (usted), third person singular (él, ella) and third and second person plural (ellos, ellas and ustedes) forms.
Both are nice, as you can see in the first line of the second paragraph (Rafael es simpático) and the first line of the third sentence (Yesica es simpática). What they do not have in common is their hair color, Rafael is dark haired (moreno) and Yesica is blonde (rubia). Both live in New Jersey, (vive en Nueva Jersey), but Rafael is African, Mexican, and American (Es africano, mexicono y es africano, mexicano, y estadounidense) whereas Yesica is Columbian (Es de Columbia).
I'm sure this isn't everything, but I hope it helps!
It's ponte that will be the answer.
Necesito B para enviar este paquete