Question

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researchers testing solar - powered cars concluded that the cars work equally well when they are exposed to two hours of sunlight as when they are exposed to four hours of sunlight.

which of the following is a piece of evidence that best supports the conclusion?

all the solar - powered cars were able to reach speeds between 40 and 60 miles per hour (96.56 km/h).

eight out of ten cars that were exposed to two hours of sunlight moved as quickly and drove as long as the cars exposed to four hours of sunlight.

when the cars were exposed to two hours of sunlight, their batteries were fully charged.

seven out of ten cars had the same size solar panels.

Explanation:

To support the conclusion that solar - powered cars work equally well with 2 hours and 4 hours of sunlight, we need evidence that compares the performance of cars in these two sunlight - exposure conditions.

• Option 1: Just stating the speed range of all solar - powered cars does not compare the performance of cars exposed to 2 hours and 4 hours of sunlight. So, it does not support the conclusion.
• Option 2: It shows that 8 out of 10 cars exposed to 2 hours of sunlight had the same speed and driving duration as those exposed to 4 hours of sunlight. This direct comparison of performance between the two groups (2 - hour and 4 - hour exposure) supports the idea that the cars work equally well in both cases.
• Option 3: Only talking about the battery charge of cars exposed to 2 hours of sunlight does not give any information about how they perform relative to cars exposed to 4 hours of sunlight. Thus, it does not support the conclusion.
• Option 4: The size of solar panels is not related to the comparison of how well the cars work with different sunlight exposure times. So, it is not relevant to the conclusion.

Answer:

B. Eight out of ten cars that were exposed to two hours of sunlight moved as quickly and drove as long as the cars exposed to four hours of sunlight.