If im being honest im stuck between answers A and D, D is more literate though so if it were me id chose it
1:b
2:d
3:Oooo I can't answer this one without context
4:b
The adjective clause in this sentence is 'who has read thousands of books'. It is an appositive, separated from the rest of the text by commas, and has an adjectival meaning - it modifies the noun, Anthony.