Final answer:
Clarisse helps Percy, Annabeth, and Tyson escape Half-Blood Hill in the Percy Jackson series.
Step-by-step explanation:
The character who helps Percy, Annabeth, and Tyson escape Half-Blood Hill is d) Clarisse. In the Percy Jackson series, Clarisse La Rue is a daughter of Ares and a Greek demigod known for her strength and warrior skills. While she often finds herself at odds with Percy and his friends, in "The Sea of Monsters" book of the Percy Jackson series, Clarisse assists them when they need to leave Camp Half-Blood to go on their quest. This shows that despite their differences, demigods can come together to help each other in times of need.