Past participle is defined as a completed action. In other words, it is a verb. Past participles usually end in -ed. With that alone, you can disregard choice A and D. A past participle shows something that had already happened in the past but it still continues on in the present. So the <em>exhilarated is the correct answer. </em> The answer again is C.
Returned is the past participle of return and it is used in the perfect form.
Past participle can also be used as adjective such as the exhilarated, option C.
Canoeing is a gerund ,that is -ing form of verb used as a noun,same applies to kayaking.
From the foregoing analysis,only returned was used as a verb in the sentence and the fact that it has ed added to it makes a past participle form of verb.
