Read this paragraph from an essay. Proving that human failings have remained consistent through the ages, French philosopher Montaigne declared that it was fear of which he was most afraid, reasoning that a person who was afraid to suffer was already in throes of the anticipated pain. This means that we suffer as much from our imaginings of what might happen as we do from what actually does happen—or rather, we suffer more, because there are times when our worst fears are never realized.
Here are four possible concluding sentences for the paragraph. Which sentence uses syntax that introduces both variety of sentence structure and an element of surprise?

If this is true, why not go boldly forth into the world?

If this is true, why not go boldly forth into the world?

Such reasoning, if true, issues an attractive call to let go of fear and venture boldly.

Such reasoning, if true, issues an attractive call to let go of fear and venture boldly.

This reasoning may be true, and if it is, we might well consider adopting a bolder strategy.

This reasoning may be true, and if it is, we might well consider adopting a bolder strategy.

If this were true, then perhaps it would be well to attempt to banish one’s fears and venture with boldness into the world.