Answer:
Letter C is the correct option.
Explanation:
Option A is incorrect since it uses two connectors that express the same idea, such as and and therefore.
B is also incorrect because before words like therefore it is necessary to use a semicolon instead of a coma.
Finally, option C, Several poets have taken inspiration from Walt Whitman's style; therefore, he's known in literary circles across the world, is the correct answer because it follow the correct rules by using a semicolon before therefore.
