23. Sally and Juan’s science teacher challenged her students to build a paper airplane that would stay airborne for ninety seconds. The students have two days to design and test their planes. The assignment will end with a “fly-off.” First Sally and Juan researched plane designs. Then they built their first plane. Whenever they tested the plane, it would take a nose dive straight into the floor. They changed the design by reshaping the nose of the plane and adding some weight to the tail. The plane flew but did not get very far. Finally, they tried to change the way they threw the plane. After many tries, their plane stayed in the air for an average of ninety-two seconds. According to the Technological Design Process, what should their next step be?
A. Designing a product C. Evaluating the design
B. Identifying a problem D. Implementing (testing) the design