GERUND 'raising' should be used in place of the infinitive 'raise' with the preposition 'of'.An infinitive is formed from a verb but doesn't ACT as a verb. It acts as a noun, adjective, or adverb, and it is actually made up of TWO words: to + verb. Gerunds are words that are formed with verbs but act as nouns. A gerund is a noun made from a verb by ADDING "-ing."HENCE, the correct answer is option 4. Correct sentence: 'I wouldn’t dream of raising the price'.