Answer:
b. All paths to success are activities involving hard work.
Step-by-step explanation:
If it is said that the only path to success is through hard work, then success involves activities that are hard-working. For example, to win a marathon it is crucial to train extremely intensely.
On the other hand, option A is incorrect because all hard-working activities do not necessarily imply that the result will be successful. For instance, training hard does not automatically mean that someone will win a marathon. Meanwhile, option C means the opposite of the given statement.