It thought of as punctuation, a half cadence is like a comma . So, the answer that you are looking for is d) half cadence.
Answer:
180 gallons of per week
Explanation:
9,400 gallons of water annually, from household leaks
We don't have any proof that he or his own child got poliomyelitis as an infant. Also, this disease has been a serious issue <em>before </em>he became a doctor, so 2 is out also.
This only leaves one answer left. =)