Idiomatic Expressions

Step 1: Understanding the idiom.
"Taken with a pinch of salt" is an idiomatic expression that means to view something with skepticism or to not believe everything that is said, which fits the context of the sentence.

Step 2: Analyzing the Options.
- (A) worth your salt: This means someone is competent or deserving of respect, which doesn't fit the context.
- (B) a piece of cake: This means something is easy to do, which is irrelevant to the context of storytelling.
- (C) taken with a pinch of salt: This is the correct idiom, meaning that the stories should be viewed skeptically.
- (D) full of beans: This means someone is energetic or lively, which does not match the context of the sentence.

Step 3: Conclusion.
The correct answer is (C) taken with a pinch of salt, as it appropriately fits the context of storytelling.