Answer: Please refer to Explanation
Step-by-step explanation:
Estella hugs a friend → wants to make others feel better
The Hormone Oxytocin has been found to give humans less stress and more happiness. This same hormone has been found to be released during hugs which signifies that hugs make human beings feel better. Estelle hugging her friend is therefore to make others feel better.
Amit invites a new student to sit with him → wants to help others fit in
More often than not, New students are quite confused and don't know how to get around or how to behave in their new surroundings. They will probably feel left out as well as they have no friends. Amit invited the new student to sit with him so that he may not feel left out.
Keshawn hides behind her parents → wants to avoid being noticed.
When someone hides behind another person, it is usually because they don't want to be noticed for whatever reason they have. Keshawn hid behind her parents and the most likely reasons is to avoid been noticed.
Chad lifts weights at the gym → Wants to be stronger.
Going to the gym trains the muscles and when the muscles are trained, they get stronger. Chad therefore lifts weights at the gym most probably because he wants to get stronger.