B. Looking under the heading "awards" in a reference book about the military
That sentence is actually an example of a simile. Similes are known to compare something to another. You can tell whether it's a simile since a simile uses either "like" or "as" in their sentence as they're comparing something.
Answer:
lack of knowledge, ignorance
17: No error
18: Not
19: Was asked
20: Which
