Final answer:
The independent variable in Princess Shuri's experiment is a) The amount of Vibranium in the suit, as that is the factor she is changing to observe its effect on the Black Panther's jumping distance.
Step-by-step explanation:
The independent variable in an experiment is the one that is changed or controlled to test the effects on the dependent variable. Considering Princess Shuri's hypothesis, "If I change the amount of Vibranium in the suit, then the Black Panther will bounce further", the independent variable would be a) The amount of Vibranium in the suit. This is because Shuri is changing this variable to observe its effect on how far the Black Panther can jump, which is the dependent variable. It is important to keep other factors, such as the type of ground the Black Panther jumps on and the time of day the experiment is conducted, constant to ensure that any differences in the jumping distance can be attributed to the changes in the amount of Vibranium.