Read the sentence.

fast food causes obesity, so if i stop eating fast food, i will never become obese.

this claim is an example of a(n)

which option most accurately completes this sentence?

slippery slope
red herring
poisoning the well
ad hominem

Not ad hominem, because that has to be directed at a person. Probably not a red herring, because that involves misdirection and clues, which seems out of order for this type of work. Poisoning the well involves making further phrases seem stupid or pointless by statements made to start. A slippery slope is an action or idea that leads to problems and issues to come, and in this case i think that applies.