Which statement represents a technological solution to a problem?

Science and technology are two related but distinct fields. Their major components are illustrated below.

Which statement represents a technological solution to a problem?
A . Astronauts conduct an experiment to see how bacteria grow in a space station.
B . Biologists study birds to learn how they migrate.
C . Students observe cell division under a microscope.
D . Engineers design an automobile engine that produces less exhaust.
E . Geologists analyze soil samples to find out soil composition.

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Answer: D