In "First Steps," which theme is developed by Maria's experiences on the planet?

A. Facing one's fears often leads to great
discoveries.

B. For most people, exploring the unfamiliar is
upsetting.

C. It is safest to think carefully before taking
action.

D. No matter how far one travels, one always
misses home.

In the sentence, “studies show that non-exercise activity thermogenesis, or n. e.a. t. — a measure of how much energy people use to stand, fidget, walk to the car and otherwise move around without formally exercising — often (declines) substantially after weight loss, perhaps because the body thinks you are starving and directs you to stay still and conserve energy,” the word declines means a. deteriorates. b. improves. c. ascends. d. increases.