Biology

The correct answer is A.Type of gasoline.

In this experiment, the independent variable is the factor that the researcher is changing or manipulating to see if it affects the outcome. Here, the researcher is testing how different types of gasoline affect the speed of the car. So, the type of gasoline is what is being altered.

Here’s why the other options are not correct:

B.Which car the gas is put into: This would be a control variable, as it should remain the same to ensure that the results are not influenced by di...