The correct answer for the given statement above would be option A. A relative pronoun usually introduces an adjective clause. A relative pronoun is a pronoun that is used to connect a clause or a phrase to a noun or pronoun. Examples are who, whom, whoever, which, whomever, whichever and that.
Would you like to learn how to keep at least five extra dollars a day? Today I will show you how switching from bottled water to tap water will allow you to keep money in your pocket and save the environment.