Is the underlined phrase an adjective phrase or an adverb phrase? of the beasts

The true king of the beasts is the elephant. A.
adverb phrase

B.
adjective phrase

Question

Is the underlined phrase an adjective phrase or an adverb phrase?  of the beasts

The true king of the beasts is the elephant.  A.
adverb phrase
 
 B.
adjective phrase

anonymous · Answer

the under lined word is of the beasts

texaschic101 · Answer

I am going with adjective phrase because an adjective phrase modifies a noun and answers the question " which one ".

Which king ? the king OF THE BEASTS.

anonymous · Answer

I also say adverb medal for me thanks.

texaschic101 · Answer

also ?? I am saying adjective