The answer is D. through Toby’s physical appearance.
The set of lines that suggests his response to the Easter Rising goes beyond personal animosity are
4. He had done most bitter wrong
To some who are near my heart,
Yet I number him in the song
During the Easter Riots, there were 66 killed and 16 executed Irish insurrectionists, and some of them migh have been friends and loved ones for the speaker. After these events, he is still coping with the tragedy and wondering whether the rebellion was worth it. Still, despite all the violence he feels compelled to acknowledge these revolutionaries in his poem.
Do you have a picture of the text?
The antecedent of a pronoun is basically the noun that a pronoun replaces, AKA the noun that the pronoun refers to. It should be somewhere before the pronoun in the sentence. In the sentence "Strikers will return to work when the union representative has completed their name negotiation," the pronoun is "their." Whose name negotiation is being completed? The strikers. This could read, "Strikers will return to work when the union representative has completed THE STRIKERS' name negotiation." That works! So, the pronoun "their" refers to the strikers.
Answer: strikers