Which words in the sentence are the complete noun clause?

the big green parrot speaks to whoever comes into the house.

a. whoever comes into the house
b. the big green parrot speaks
c. into the house
d. the big green parrot speaks to whoever

Among the options provided above, the noun clause is:

A.    whoever comes into the house

Noun clause is introduced by words such as whoever, whomever and others. It is a dependent clause which can act as a noun, subject, direct or indirect objects, predicate nominatives, and preposition objects. 

onto a large boat, and mark the water level that the boat sinks to. then, take the elephant out and put a bunch of marked weights onto the boat until it reaches the same water level. add up the masses of the weights to get the weight of the elephant.

can you tell me the answers to this