The correct answer is "a technique used in writing or speaking that is intended to persuade". There are numerous ways of doing this, however the most famous is using the three rhetorical techniques used by Cicero, the ethos, logos, and pathos.
I agree with lack of physical activity and a unhealthy diet with lack of physical activity this could lead to heart disease and much more health risks.
One strategy you can use to determine the meanings of unknown words and phrases is to look at the context clues. Context clues might be something like a picture, words or phrases you already know, using what you know about the text already.
Hope this helps!
Out of your 3 possible answers, B. ones' is the correct one and I will explain why. Answer A is a contraction of one and is. When you put "one is" into the blank space you can tell that it is not right. Answer C is incorrect because when you place an apostrophe after an s it is implied that there should be another s that follows and so you do not need to put it there. This means that answer B is correct since it doesn't have the extra s.