C i’m pretty sure because the punctuation with her name.
Answer:
Uncle Marcos - Nivea's favorite brother, and Clara's favorite uncle. He is an explorer and inventor who stays with the del Valle family between trips. Although Uncle Marcos dies early on, he leaves his books and stories, which pass on to every del Valle-Trueba child.
Is there something you have to read on it?
The man whose hands were tied and whose fate was on the plank as he stared at the stream below him, reminiscing his life, would have been part of the confederate army whose post was ambushed by Union soldiers while they were asleep. It might've been on the point where he held out for some time but instead cracked under pressure and told the Union soldiers all that he knew. The captain or sergeant or colonel ordered his execution, thus the situation which the passage mentioned. This may or may not be the Union soldiers led by Colonel Abel D. Streight.
Basis:
1) The mentioning of Alabama, one of the places of battle during the Civil War where it was mentioned that Col. Streight was in charge of Union Troops back in ca. 1862.
2) The describing (or discreet mentioning) of the Federal Army. The Federal Army is the northern army of the Civil War, hence the Civil War setting.