Correct Answer: beside

Solution : The correct answer is option 3

Explanation:

• - We use across as both a preposition and an adverb (adv).
• - Across refers to being on the other side of something, or moving from one side to the other of something with sides or limitations, such as a city, road, or river.
• - We use over as a preposition and an adverb to indicate to something that is higher than something else, which may involve movement from one side to the other.
• - The preposition beside implies 'at the side of' or 'next to'.
• - Besides is a preposition or connecting adverb that signifies 'in addition to' or 'also'.
• - As a result, to make the statement grammatically correct, the preposition 'beside' should be employed.
• - As a result, the right answer is 'beside'.