What does the preposition "to" indicate?

The preposition "to" primarily indicates movement or a direction toward a particular place, person, or thing. It signifies the destination or goal of an action, which often involves a sense of forward motion or advancing toward. For example, saying "I am going to the store" implies that the speaker is moving in the direction of the store.

The other options represent different relationships. "Against" refers to a position or movement in opposition to something, while "from" indicates the origin or starting point of a movement or action. "Alongside" suggests a position next to something rather than movement toward it. Thus, the understanding of "to" as indicating "in the direction of" accurately encompasses its role as a marker of destination in movement or intention.