Correct Answer:
C. For
The correct answer is For because the adjective 'bound' requires the specific preposition 'for' when expressing movement or direction toward a final destination.
- For: This is the correct choice. In English grammar, 'bound' acts as a predicate adjective meaning 'destined' or 'on the way to'. It forms a fixed idiomatic collocated pairing with 'for' for example, 'bound for home', 'outward bound for sea' to indicate a vessel's intended route or terminal stop.
- Incorrect Options:
- Onto: This is incorrect. 'Onto' is a preposition of movement used to show tracking or placement on top of a physical surface, for example 'climbing onto the roof'. It cannot be used to establish a geographic travel destination.
- At: This is incorrect. 'At' is used to show a static, exact position or location in space, for example 'the ship is at the harbor'. It cannot be paired with 'bound' to indicate a future heading or ongoing voyage toward a country.
- None of these: This is incorrect because the preposition 'for' is the universally accepted standard structural choice.