Hi !!
Sandrine est très timide. Je lui ai parlé mais elle ne veut pas parler avec tout le monde.
(Sandrine is very shy. I spoke to her but she doesn't want to speak with every one).
A) ai parlé = j'ai parlé (I spoke)
B) l'ai parlé = incorrect
C) lui ai parlé = spoke to her
D) t'ai parlé = je t'ai parlé (I spoke with you)
Hope it helps to understand :)