Where could the sentence be added into the paragraph?

[Hieupt]

Hi all,

Please help to review the following paragraph and advice me that where the sentence "If he or she has unhealthy habits, the patient should consider giving them up." would be added in.

[A] Pathological fatigue means the patient's tiredness might be a sign of a more serious disease, such as cancer or diabetes. [B] It could also be a side-effect of medicines or a result of bad habits such as smoking too many cigarettes or drinking too much alcohol. [C] If the patient's medication is at fault, the doctor may be able to prescribe a different one. [D]

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My answer was [D] but the book says [C].
I think that in 2nd sentence, it mentions "side-effect...." first, then "bad habits". So in sequence, the suggested treatment should follow that sequence, shouldn't it?

Thank you for your time.
Hieu.
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Thank you very much,
Hieu Phan.

P/s: Please just correct if I'm wrong somewhere!

[Cerberus™]

I agree with your reason for inserting it at D.
Perhaps the one who made this test wanted you to simply insert it as soon at the key-word "bad habits" had fallen, i.e. immediately after the first sentence that mentions it. To me, your answer seems better than that.

[Hieupt]