Leia a citação atribuída a Charles W. Eliot, eleito presidente da Universidade de Harvard em 1869.

“Books are the quietest and most constant of friends; they are the most accessible and wisest of counselors, and the most patient of teachers.”

(https://teachyourkidscode.com/best-education-quotes/)

All the adjectives in the quotation are used in the superlative form. Mark the alternative in which the superlative form has been correctly used.