It is quite simple. When a question like this arises, just take the answers they have given you and replace them for “profoundly.” Whichever makes the most sense will be the answer. “It turns out cats doubtfully improve their owners lives.” That doesn’t make sense.
“It turns out cats calmly improve their owners lives.” Doesn’t make all too much sense.
“It turns out cats simply improve their owners lives.” I don’t think this is the answer, as it doesn’t make too much sense.
“It turns out cats greatly improve their owners lives.”
The answer is C/#3/Greatly.
