Explanation:

- In marriage contracts, fraud involves willful concealment of material facts, like a serious health condition.

- Here, the girl's relatives did not reveal her epileptic fits, which is significant information for marriage consideration.

- Fraud (Option 1) specifically covers situations where there is deliberate hiding of essential facts.

- Misrepresentation (Option 2) applies if the concealment was unintentional or by mistake, which is not the case here.

- Undue Influence (Option 3) relates to pressure or influence over a party, not about hiding facts.

- None of the above (Option 4) is incorrect since a valid ground exists.

- Correct Answer: Option 1 - Fraud