What things, concepts, or objects are personified in "The Road Not Taken"?
Personfication is a figure of speech whereby inanimate objects, such as stones or trees, are given human qualities and therefore a comparison is created. An example would be talking about a clock staring at you with its face. Clearly, clocks can't literally stare, but the face is compared to a human face and thus the clock is given the human action of staring.
Bearing in mind this definition, we can see that actually no things, concepts or objects are personified in this poem. The poem is actually told in a very simple style which is sparse of figurative language and literary terms. You would benefit from analysing this poem focusing on the imagery that is employed instead and considering what the scenario is used to represent.