Explanation:

Here’s the thing—let’s break it down:

- An illegal agreement is always void. The law doesn’t recognize contracts that involve illegal acts, like an agreement to commit a crime.

- But not all void agreements are illegal. Some are void for other reasons, like uncertainty (“Let’s agree to decide the price later”) or lack of capacity, but there’s nothing unlawful about them.

Here’s what the options mean:

- True: All illegal agreements are void, but not all void agreements are illegal. (This is correct)

- Partly True: Implies this holds only in some cases—not accurate here.

- False: Would mean the statement is completely wrong—not so.

- None: There’s a clear, correct answer in the list.