Final answer:
Malai decides to volunteer at the elephant sanctuary during the summer to contribute to the conservation and protection of elephants.
Step-by-step explanation:
The main reason Malai decides to volunteer at the elephant sanctuary during the summer is to contribute to the conservation and protection of elephants. By volunteering, Malai can help ensure the well-being and safety of the elephants, especially those outside of parks and reserves that may be at risk due to defensive killing and poaching.