Preposition - Study Mode

Explanation

Solution: The correct answer is C: upon Let's break down why: * Prepositions are words that show the relationship between a noun or pronoun and other words in the sentence. * Think of them as showing location, direction, or time. * "Upon" is a more formal and slightly stronger version of "on". * In this context, "The wheels of the truck press upon the road" suggests a direct and forceful contact. * Why not the others? * "On" could work, but "upon" is a slightly better fit because of the weight and pressure implied. * "Against" suggests resistance or leaning, which isn't quite the same as wheels pressing down. * "Over" suggests passing above or across, not direct contact with pressure. * Therefore, "upon" is the most accurate preposition to use here, describing the direct pressure of the truck wheels on the road.