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

[EX Q]: Humans begin laughing at _ to three months of age.
[EX A]: two

[EX Q]: Albino barbs are a light yellow with _ barely visible stripes.
[EX A]: four

[EX Q]: Major depression strikes one in four women, and _ in ten men during their lifetime.
[EX A]:
one