Answer:
"my".
Step-by-step explanation:
Pronouns are those words that replace or are used in place of nouns so that the noun does not repeat itself again and again in a sentence. On the other hand, adjectives are those words that describe the nouns in a sentence.
So, in the sentence "I handed my flowers to her in front of everyone", the nouns are "I, my, her, everyone". Among these pronouns, the one that describes a noun is "my", describing the noun "flowers".
Therefore, the correct pronoun that functions as an adjective is "my".