Final answer:
The most likely conclusion to the short story is that after having observed something that signifies perseverance, Bruce gathers his men and formulates a plan leading to the defeat of the King of England.
Step-by-step explanation:
The conclusion to the short story that is most likely to follow from what Bruce has observed is option B: "He arose and called his men together. He told them of his plans, and sent them out with messages of cheer to his disheartened people. Soon there was an army of brave Scotch-men around him. Another battle was fought, and the King of England was defeated."
This conclusion follows the common storytelling motif of the underdog recovering from a defeat and rallying to achieve a final victory. The determination and plan of action after observing something in his environment – like the spider, possibly implying perseverance and resilience – lead to an overall conclusion of triumph against adversity.