Answer:
laughter may have healing properties
Explanation:
"this discovery" as stated in the text is actually referring to "laughter may have healing properties".
From the passage, we discover that it was stated that the doctors reveal that laughter may have healing properties.
Also, the last line of the text revealed that "the discovery" is having a phenomenal influence on health care. It is only laughter that can bring something phenomenal among the other options given.
Something phenomenal is referring to something remarkable. Therefore, laughter is what can make bring a phenomenal influence on health care.
The correct answer is D. Marriage restricts one's freedom. This is because of the fact that even though her husband was not a bad man who beat her up or something similar, she was still kind of happy when she heard he died, because she would get to live her life as a free woman, instead of a housewife. This is why it was considered to be a controversial story when it came out.
Something known by a lot of people, is " common " knowledge.
