In areas where rats are a problem, it is very difficult to exterminate them with bait poison. The reason for this is that some rats eat enough poison to die but others eat only enough to become sick and then learn to avoid that particular poison taste in the future.
a Explanation.
b Argument; conclusion: In areas where rats are a problem, it is very difficult to exterminate them with bait poison.
c Argument; conclusion: Some rats eat enough poison to die but others eat only enough to become sick and then learn to avoid that particular poison taste in the future.
d Conditional statement.