Which sentence correctly uses commas to offset a phrase in the sentence? O It may take me months, if not years, to train for a marathon.
O My dog a poodle named, Toby, will do tricks for food.
My cousin who lives in another state, will visit us, this fall.
o I went, to a late-night rock concert, with my best friend.

The first option

It may take me months, if not years, to train for a marathon correctly uses commas to offset a phrase in the sentence. So, the first option is the answer. Hope it helps!

A. It may take me months, if not years, to train for a marathon.

Explanation:

Commas are a punctuation mark , used chiefly to show separation of words or word groups within a sentence.

"facing the rising sun of our new day begun

let us march on till victory is won.",

because the rising sun is a symbol of hope.