Based on the context, the meaning of Bear will be "to join in and help out". Thus, the correct option is D.
What is the context?
Context refers to a situation that is connected to the present scenario and creates an effect on the plot. In this situation, the poet has said that he will never be called to bear my part which shows that he will not invite anyone to carry the responsibility.
The word "bear" refers to carrying something, in this context when bearing my part has been mentioned, it will be expected about the help that i will not call you for helping me out in carrying the responsibility or showing your talent.
Therefore, option D is to join in and help out is the correct answer.
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