RA wrote:
I would go for (E).
-- "helpful in demonstrating" in choice (E) is the correct idiom.
-- "cannon shooting dead chickens" in choice (A) is not as clear as "that shoots dead chickens" in choice (E)
Please confirm the answer.
I feel the answer shall be A because:
In E, It says that cannon (cannon is subject) has proved something
In A, It says that cannon shooting the dead chickens (this whole noun phrase is subject) has proved something.
Please let me know if you have different opinions.
many thanks