Question

After discovering that children who grow up on farms are less likely to suffer from asthma and allergies, researchers is trying to isolate the compounds in farm dust that lead to this protection.
Choose 1 answer:
Choose 1 answer:
(Choice A) NO CHANGE
A
NO CHANGE
(Choice B) tries
B
tries
(Choice C) has tried
C
has tried
(Choice D) are trying
D
are trying

Answer 1

D) are trying