What did people initially think caused cretinism and goiter?

Which action best increases one’s stamina a) exercising when you feel like it b) saving so much that one like sleep c) refusing to exercise to save the energy needed to work d)exercising on a regular basis

Which of these is an accurate and appropriate summary of paragraph 4? a) the speaker talks to her sister who understands politics. b) the speaker talks to her sister about all of her problems. c) the speaker wants her sister to tell her which party is best. d) the speaker is trying to find out who her sister is voting for.

Ireally need to know this answer asap