Explanation:

- Option 1: apartheid

- "Apartheid" is spelled correctly. It's a policy or system of segregation or discrimination on grounds of race, historically associated with South Africa.

- Option 2: exhorbitant

- The correct spelling is "exorbitant." It refers to unreasonably high prices or demands.

- Incorrectly spelt word

- Option 3: mischievous

- "Mischievous" is spelled correctly. It describes someone who enjoys causing trouble in a playful or harmless way.

- Option 4: benefited

- "Benefited" is the correct spelling for the past tense of "benefit." It means to receive an advantage or gain.