Final answer:
The mid-20th century British writers group known as the 'Young Men' refers to the Angry Young Men, distinct for their confrontational writing about societal issues and working-class struggles.
Step-by-step explanation:
The 'Young Men' group of mid-20th century British writers being referred to is b) The Angry Young Men. This group emerged in the 1950s and is well-known for expressing their contempt and disillusionment with British society at that time. They felt society was stifling and that the working class was given fewer opportunities to succeed.
The writers were characterized by their confrontational style and their depiction of the frustrations of the young working-class. This group is distinct from the Lost Generation, which was a term used to describe a group of writers who came of age during World War I and were known for their disillusionment with the era.