Final answer:
The correct answer is option a. The deceitful man in the white robe is Hypocrisy from John Bunyan's 'The Pilgrim's Progress', symbolizing outwardly pious individuals who are inwardly dishonest.
Step-by-step explanation:
The deceitful man in the white robe who speaks beautifully but ensnares Christian and Hopeful in a net is character A) Hypocrisy from John Bunyan's The Pilgrim's Progress. This character is symbolic of individuals who maintain an outward appearance of virtue and piety but are inwardly corrupt and dishonest.
Bunyan uses characters like Hypocrisy to illustrate spiritual and moral lessons, highlighting the dangers of deceitful behavior and the importance of genuine faith and conduct.