Final answer:
The central idea is that despite John Burns' old-fashioned clothing, his fellow soldiers recognized his dedication to the Union, corresponding to option A.
Step-by-step explanation:
The central idea of this excerpt is that John Burns, despite his old-fashioned clothing and the initial mockery he faced, was soon to be respected by his fellow soldiers for his commitment to the Union cause. This aligns with option A, which states that John Burns wore old-fashioned clothing, but his fellow soldiers learned that he was still strongly devoted to the Union.
This excerpt illustrates the importance of not judging individuals solely based on their appearance, a recurring theme in military history where uniforms have often been a symbol of discipline and unity. However, the respect and recognition of a soldier's value come from their actions and dedication, as opposed to their attire.