Answer:
We learned about unconditional love and loyalty, because Doodle loved him always, even when the narrator was treating Doodle with deliberate cruelty. We learned about gentleness and sensitivity. (We remembered watching Doodle struggle alone to bury the ibis.)
The bottom left graph is the best answer
The correct answer is - Coincidentally, my oldest sibling, Nate, just turned nineteen.
It is quite easy to spot a subject - just ask the question who. Who just turned nineteen? - My oldest sibling.
The first option is incorrect because the phrase is used as an indirect object. C is incorrect because my brother Nate is the subject, and my oldest sibling is the appositive. D is incorrect because Nate is the subject, and my oldest sibling is predicate nominative.
