Which words in the sentence are the complete noun clause? before the big race, my concern was whether i'd finish. a. before the big race b. my concern was c. was whether d. whether i'd finish

The correct option is (d) i.e. whether I'd finish

A noun clause is a group of words that act as a noun.

Tip:
The noun clauses can be identified in following ways:
If the word begins with which, when, how, whether, that, what, whatever,who, whoever, whom, whomever etc.

The answer is d . whether i`d finish