Answer:
The correct use of the apostrophe is %s
Step-by-step explanation:
The apostrophe in the examples that we have in here represent possession, it could be in singular or plural, the first option talks about a possessive of the percentage with is not correct, the third option only has the apostrophy without the s and it is incorrectly written in any way, the fourth option is possessive for a plural, option two that is the one without any use of apostrophe is the correct one since it refers to the use of percentages as a symbol in plural.