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

[EX Q]: Southern moles are six to seven inches long and weigh _ to four ounces.
[EX A]: three

[EX Q]: Trees can also be air layered but air layering usually takes four to _ months to be successful.
[EX A]: six

[EX Q]: Heavy chain has one V region and _ or more C-regions.
[EX A]:
three