In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

[EX Q]: Postpartum blues are common during the _ months after childbirth.
[EX A]: three

[EX Q]: Abdominal scars consist of _ to four half-inch incisions.
[EX A]: two

[EX Q]: Stroke is the nation's number _ killer and the leading cause of adult long-term disability.
[EX A]:
three