Final answer:
In 'The Pilgrim's Progress,' Christian receives new clothes and a certificate from Discretion, Mercy, and Goodwill. These three are celestial creatures encountered in the allegory.
Step-by-step explanation:
The three celestial creatures who clothe Christian with new clothes and give him a certificate in the allegory are named Discretion, Mercy, and Goodwill. These characters are encountered by Christian in John Bunyan's 'The Pilgrim's Progress' which is a Christian allegory written in 1678. Other virtues mentioned like Faith, Hope, and Charity are known as the Theological Virtues and are personified in various forms of art and literature but they are not the ones who provide Christian with new clothes and a certificate. The correct answer to the question is D) Goodwill, Mercy, Discretion.