locations of adverbs to modify " in order to~"

Please first look at the following question.

"Carmelo Industries urged its customers to purchase memberships _______ in order to take advantage of the terrific deals"
(A) usefully (B) early (C) enough (D) hardly

The correct answer is (B) early. I think (C) enough is more suitable there.
[Q1]
Is the reason (C)enough can't be an answer due to the location of "enough"?
My thought)
enough in order to take advantage(x)
in order enough to take advantage(o)
enough in order to take advantage(x)

[Q2]
Where can I put adverbs in order to modify "to take advantage"
1) early in order to take advantage (o)
2) in order early to take advantage(also okay?)
3) in order enough to take advantage ( Particularly "enough" has to be in frond of "to take advantage", Am I right?)

Thank you for your answer in advance.