The main reason why Old Major says he is "one of the lucky ones?" is B. He is twelve years old.
This shows that he is an old animal and he would not have to work for much longer, as he believes that he would not live much longer as their lives do not reach their natural span.
This refers to the use of words to show the sequence of events to tell a story, with the aid of a narrator.
Hence, we can see that the words of Old Major ''And even the miserable lives we lead are not allowed to reach their natural span. For myself I do not grumble, for I am one of the lucky ones." shows that he would not live much longer as their lives do not reach their natural span.
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