The answer is A: The argument is not sound the author uses circular logic.
The train stopped just a few inches before the handcar. The driver got out and harnessed the handcar to the engine and slowly started moving towards the station. The boys felt relaxed.
Answer:
a.
an informal definition
Explanation:
The definition used about corns is an informal one because the author did not make use of any kind of statistic to show that corns are vulnerable to certain kinds of worms and also did not mention the names of worms the corn is vulnerable to.
When something is said to be informal, it means it is not yet official.