Select the most appropriate option for blank(1)
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. on.
The correct preposition is "on" because it indicates the effect or influence something has over a particular subject or area.
In this case, the elephants' diets have an impact on their surroundings, which is the intended meaning.
The other prepositions ("at," "over," and "in") do not convey this relationship as accurately.