Talk about multiple choice questions

Almost all objects will partially dissolve once they come into contact with water.

D as soon as possible means "just ..." It is equivalent to a conjunction. If once used, this sentence should be changed to a part of water solvent, almost everything comes into contact with it. Because contact cannot be used alone here, it must be followed by an object associated with it.

If you choose C, this constitutes an attributive clause. Before the preposition with came to which, the whole sentence was equivalent to a part of near everything. Modify everything. That makes sense.

I hope I can help you!