**The reasoning**
After a preposition like "for," "with," "to," or "between," you must use the **object pronoun**, not the subject pronoun.
Here's the rule: Prepositions take objects.
The preposition is "for" → so you need the object form.
- Subject pronouns: I, he, she, we, they (do the action)
- Object pronouns: me, him, her, us, them (receive the action)
Test: Remove "you and" — would you say "This gift is for *I*"? No! You'd say "This gift is for *me*."
So: "This gift is for you and **me**."
**Why the wrong options tempt you**
**A) I** — sounds "proper" to some people, but "I" only works as a subject (like "I run"). After "for," it's grammatically wrong.
**C) my** — is possessive (my book), not an object receiving the gift.
**D) mine** — also possessive, means "belonging to me," but doesn't fit after prepositions in this structure.
**Quick takeaway**
After prepositions (for, with, to, between), always use object pronouns: *me, him, her, us, them* — never "I" or "my."