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

[EX Q]: Sake contains _ preservatives or sulfites.
[EX A]: no

[EX Q]: Frozen grafts can have a shelf life of up to _ years.
[EX A]: five

[EX Q]: White light is made up of _ primary colors.
[EX A]:
three