Zack is mapping the argument: "The jury ought to ask the judge for guidance because a confused jury has a duty to ask for guidance." When analyzing the argument Zack determined that it relied on an assumption that was unspoken, namely that the jury is confused. Which shape should Zack use to map that implicit assumption?
a. line with one arrowhead
b. orange oval
c. blue cloud
d. green rectangle
e. red hexagon