Question

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? 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. all the solar-powered cars were able to reach speeds between 40 and 60 miles per hour (96.56 km/h). seven out of ten cars had the same size solar panels. when the cars were exposed to two hours of sunlight, their batteries were fully charged.

Explanation:

The conclusion is about solar - powered cars working equally well with 2 or 4 hours of sunlight. Option A shows 8/10 cars with 2 - hour exposure performed as well as those with 4 - hour exposure, directly supporting the conclusion. Option B is about speed range, not comparison of 2 - hour and 4 - hour exposure. Option C is about solar panel size, irrelevant to the conclusion. Option D only talks about 2 - hour exposure battery charge, not comparison.

Answer:

A. 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.