Which best describes what happens to sunlight after it passes through the key
it converges into one particular shadow region.
it spreads out into multiple shadow regions
it bends back toward the door.
it scatters back toward the door.

Engineers find a new metal that is stronger than steel but much lighter. this material is also significantly cheaper than what is currently used for most aircraft, available in large quantities, and easy to manufacture. the engineers are excited because this new material will lower the costs of buying and operating airplanes for companies. what is probably the best step for the engineers to make next?