Fact 1: Astronauts require preserved food for extended flights. Fact 2: An astronaut is a scientist who is a space explorer. Given the two facts above, a scientist who is a space explorer requires what for extended flights?

Possible answers: a. preserved food; b. salt and water.; c. hydration; d. a hydraulic system; e. useless heavy objects; f. short-lived food; g. hydrate their cells; h. perishable food;
Answer:
a.