I think it may be “one is much longer and complex than the other”
I'm not sure what the choices are but if they are the parts of speech then the adjective is the correct answer :)
Answer:
It is a noun phrase.
Explanation:
This is because a noun is being used here and it has a part of a sentence having no finite verb.
Answer: To warn you.
In this excerpt, it is clear that King Arthur knows that Queen Guinevere has been unfaithful to him. He makes this clear when he states <em>"I send you three grey cats with gifts, Queen Guinevere, To warn you, sleekly, silently."</em> This sentence indicates that the present has been sent not as a kindness, but as a warning. These lines change the tone of the poem to one that is threatening.