Which example of dialogue is formatted correctly? I said to her “Have fun on your summer vacation.”
I said to her, “Have fun on your summer vacation.”
I said to her “Have fun on your summer vacation”.
I said to her, “have fun on your summer vacation.”

I said to her, "Have fun on you vacation."

Explanation:

Since the parentheses are starting another sentence you want to capitalize the  beginning of the sentence but also want to but the comma in it.

i think its d, but grammarly says none

explanation:

i agree definitely that