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

[EX Q]: Sunlight causes skin cancers in _ ways.
[EX A]: two

[EX Q]: Telescopes come in _ basic types - refractors and reflectors.
[EX A]: two

[EX Q]: Water includes ocean up to _ miles offshore.
[EX A]:
three