Option C: This is the correct because the sentence is punctuated in the right way: 'Prince' and 'Smith' are proper nouns so both will begin with a capital, and the sentence ends with a full stop.
Option A is incorrect because the question mark (?) is not required here. The sentence is not in the form of a question (Will Prince and Smith go for an outing?)
Option B is incorrect because the comma ',' is not required. A comma brings in a pause in a sentence, but it isn't used in between the subject and the verb.
Option D is incorrect because the proper noun 'smith' is not capitalized and the common noun 'Outing' is. Also, the sentence ends with a (?), which is wrong.