Explanation:

Let’s break it down:

- Option 1: Stronger party

- This is actually the correct answer. When a contract is challenged on the ground of undue influence, the law assumes the stronger party (the one in the position to influence) must prove there was no undue influence. The burden isn’t on the weaker or influenced side.

- Option 2: Weaker party

- People often guess this, but it’s not right. The law steps in to protect the vulnerable: if a relationship hints at possible undue influence, the person who’s in control has to justify that everything was fair.

- Option 3: Court to prove the undue influence

- Courts decide, they don’t gather evidence themselves as proof—the parties must present the evidence.

- Option 4: None of the above

- Not relevant because Option 1 fits the bill.

So, option 1: stronger party gets the .