H D5 TS Q29 – Selective High School

“The person who bought the dilapidated (broken down) house is not well-off but has the necessary skills to renovate the property.”

If this is true, which one of these sentences must also be true?

If Brooks has the necessary skills to renovate a property, he could not have bought the dilapidated house. If Brooks did not buy the dilapidated house, he cannot be well-off. If Brooks did not have the necessary skills to renovate the property, he could not have bought the dilapidated house. If Brooks did not buy the dilapidated house, he must be well-off.

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If this is true, which one of these sentences must also be true?