Which sentence uses the word juxtapose in the sense closest to this definition?

juxtapose: to place side by side, especially for comparison or contrast

a. by juxtaposing the different books on the subject, he chose the best-written one.

b. the artist juxtaposed life and death as colors in his painting to demonstrate his views.

c. he couldn't decide which television to buy even after he decided to juxtapose them.

d. the mother believed that juxtaposing the twins would have been a futile endeavour.