The correct option is B whether I will get selected- complement of a verb
A noun clause is a dependent clause that functions as a noun. It usually
begins with what, whatever, whom, that and other such relative
pronouns. A noun clause can act as a subject, object, predicate
nominative or object of a preposition, in a sentence.
A verb complement is a word, a phrase or a clause that is added to the verb to complete its meaning.
The
noun clause "whether I will get selected" is a verb
complement; the verb "wonder" makes no sense if it isn't followed by a
word that complements it. The noun clause in A functions as a verb
complement, hence it is correct.
Option B is incorrect because the verb "wonder" is an intransitive verb, i.e., a verb that does not require an object.
Option C is
incorrect because it is neither the noun clause nor the subject; "I" is the subject and a noun clause cannot contain the main verb (wonder).
Option D is incorrect because it is a part of the noun clause, which is a verb complement. Also, the predicate includes the main verb (wonder) which isn't in this option.