Final answer:
A) Taking different roads and the decisions one must make in life.
The extended metaphor in Robert Frost's 'The Road Not Taken' compares taking different roads in a wood to making life choices, where choosing the less traveled road represents choosing an unconventional path in life.
Step-by-step explanation:
The poem The Road Not Taken by Robert Frost uses an extended metaphor in which the act of choosing a path in the woods represents life's choices and decisions. The two things being compared in this extended metaphor are A) Taking different roads and the decisions one must make in life. Frost reflects on the decisions he has made and how they have shaped his life, indicating that choosing the less popular or unconventional option (the one less traveled by) has made a significant difference in his life. Throughout the poem, Frost's appreciation for nature is evident, as he describes the scenic yellow wood and the roads he encounters.