1.what is the function of the noun clause in this sentence?
the investigation of the bank robbery determined who committed the crime.
a. subject
b. indirect object
c. appositive
d. direct object

The correct answer is:  [D]:  "direct object"

The "noun clause" in the given sentence is "who committed the crime" ;  since this "noun clause" described a "person" (which is a "noun").  Note that a "noun" refers to a "person, place, or thing".

This "noun clause" refers to a "direct object" ; since this 'noun clause' (or "person", i.e. "noun", if the "noun clause" were substituted with the proper noun) is directly receiving the action by the verb, "committed".  

Note:  The crime was not committed "for someone" (i.e. for the purpose of someone/ on behalf of someone/ or in honor of someone/ or in exchange for the favor of someone, but:  "directly by someone" .

As such, this 'noun clause' is a "direct object" ;

         →  which corresponds to:

 Answer choice:  [D]:  " direct object " ;

          →  which is the correct answer.

Hope this is helpful to you!

   Wishing you well!

The answer is direct object. I just took the quiz

Explanation:

can you finish the question hun

the answer is   c the cold war