Fill in the gaps with the correct option. Tony ______ next week.

The sentence describes a future arrangement or plan. The present continuous tense ('is going') is used to express future arrangements. Therefore, 'is going sightseeing' is the correct option. The phrase 'next week' indicates a future event. The present continuous tense is appropriate for planned future events. The other options do not fit the grammatical structure or intended meaning for a future arrangement. is going sightseeing