Answer:
d. not raising her hand when the teacher asks a question.
Step-by-step explanation:
Social loafing is having the tendency to do less effort while in a group compared to when you're alone.
Not raising your hand when teacher asks a question is such behavior, because you don't want to make it look like you're interested or working.
Answers A and B are the opposite of social loafing, since you would be paying attention and work publicly by assisting others.
Answer C doesn't have a direct relationship with social loafing, but a loafer will usually not sit in front of the class, he's sit in the back, trying to be ignored.