A gerund is the derivative of the present participle form of the verb that functions as a noun. These may be subjects, subject complements, direct objects, indirect objects or the objects of the preposition. <em>Thus, the word that justifies the above claim and functioning as a gerund is 'driving' as it is functioning as the subject of the verb "was". The other options exemplify the adjectives as they are modifying the noun rain, wind, and adventure while 'driving' is functioning as a noun.</em>