The answer is B. They first appeared in the 19th century which includes the 1900's. The others are just opinion.
If you mean how does use of questions contribute to the development of ideas in general, then it makes the raiders think as they read.
It's called the hook because you "hook" your audience into listening to you
An irregular verb is a verb that does not follow the normal pattern of inflection.
some examples of an irregular verb are
felt
went
they are verbs that end in ed-
