The most appropriate preposition to use in the given sentence is “of”. A preposition is a word placed before a noun or pronoun to show its relationship with another word in the sentence. Prepositions are usually used to indicate direction, location, time, etc.
In the given sentence, “of” shows possession, i.e. it expresses the relationship between the man and the possessions. In other words, it indicates that the man took away something that belonged to the speaker. Therefore, the correct answer is Option A “of”.

Examples:
• The cat jumped off the table. (Here, “off” shows direction.)
• We are leaving in an hour. (Here, “in” shows time.)
• She was looking for her book. (Here, “for” shows purpose.)