Respuesta :
B. "whatever dogs they train" is a clause with a subject (they), a verb (train) and a direct object (whatever dogs). The clause acts as the object of the preposition "to": Veteran trainers offer a great deal of love and discipline to [them]. This option is, in fact, the answer.
Noun clause refers to the group of words acting as a noun. They do not form a complete sentence, in other words, these are dependent clauses.
A noun clause can act as an object of preposition also. A preposition is included in a noun clause in order to give further details.
Therefore, the sentence in which the underlined clause is a noun clause that functions as the object of a preposition is:
Veteran trainers offer a great deal of love and discipline to (whatever dogs they train.)
wherein 'to' is the preposition modifying the noun clause "whatever dogs they train."