Final answer:
John Fury naming his son 'Tommy' after a relative with a large nose is an example of irony, highlighting an unexpected contrast in the naming choice.
Step-by-step explanation:
The naming of John Fury's youngest son 'Tommy' after a family member with an 'enormous' nose is an example of c) Irony. Irony often involves a contrast between expectation and reality, where a name that is expected to represent one thing actually symbolizes a contrasting feature such as a notable physical trait. Referencing 'Tommy' after a relative with a distinct nose, without intention for the name to relate to that trait, makes the situation unexpectedly ironic as opposed to a direct result of genetic influence, which would suggest a biological reason for the naming.
The provided text from Youth's Magazine discussing the character Tom Vincent and the unnamed man with a dog in the revised story illustrates the broader themes of heredity and environment. These themes explore how various factors, such as genetic traits or cultural influences, play roles in shaping human conditions. However, the naming of 'Tommy' doesn't directly relate to heredity but rather to a serendipitous or whimsical decision by John Fury.