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D. Mirror

The poem ‘I Look Into My Glass’ was about how the speaker looks himself in his mirror and views how aged and frail he has become, and he wishes that his heart was also weakened and reduced. The contrast of his aged physical body and his heart which is still young and vibrant is the main theme of the poem.
In the poem "I Look Into My Glass," the "glass" likely refers to a mirror. The answer to your question would be the fourth option.  The author views himself just like in the mirror in which he regretted because he wanted to be more kind and would not want to be heartless when he was still  young.