Possible answers: a. hydrogen and oxygen; b. preserved meals; c. solid, liquid, gas; d. small meals; e. fresh meals; f. Dehydration; g. nutrients; h. surprise meals;
Given those answer options, answer the question: Fact 1: Astronauts require preserved food for extended flights. Fact 2: Custom foods and meals can be created. Given the two facts above, what do astronauts need for extended flights?
A:
b.