Which of the following describes ready-made art?

a. It displays the artist's skill.

b. It challenges all of the conventions of art.

c. It is hand-crafted, and signed by the artist

d. all of the above

The correct answer is option B "It challenges all of the conventions of art".

Ready-made art is a type of junk art that challenges fundamental assumptions about art works, these works of art usually display no evidence whatsoever, of the artist’s skill, and show no trace of the artist’s hand (except for the signature).

B. it challenges all of the conventions of art