¿qué puedo traer a la fiesta? ud. el pan.
a. traiga
b. trae
c. traen
d. traigan

Traiga el pan Ud.

Why?
B) Trae could be correct, but it's present tense, not future tense.

C) Traen is past present tense, not future tense.

D) Traigan is for a group, here it's only one person, Ud.

This is how we get A) Traiga, because we use the present tense and the one-person word.

Hope this helps!~

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Enrique derribó la casa de muñecas de su hermana