Final answer:
The manipulated variable is the type of skateboard, and the dependent variable is the length of the jump. This means option A is the correct answer.
Step-by-step explanation:
In an experiment, the manipulated variable is the variable that is deliberately changed to observe its effect on the dependent variable. The dependent variable is the outcome that is measured to see how it is influenced by changes in the manipulated variable.
In the context of the given scenario where Hope and Elizabeth are determining if a new type of skateboard leads to a longer jump, the manipulated variable is the type of skateboard used (the new aerodynamic skateboard vs. a regular one), and the dependent variable is the length of the jump in the air off the ramp.
Therefore, the correct answer to the question is:
A) Manipulated Variable: Type of skateboard; Dependent Variable: Length of jump.