Answer
C. At a stores magazine rack
Explanation;
Printed sources include sources such as books, journal articles, magazines, etc.
They are used provide the evidence for most of the academic essays you will write in college.
On the other hand Non-print sources include materials such as web pages, works of art (performance and fine), and interviews are often used to provide significant source material for analysis .
D). Both discipline and love are necessary in raising a child.
You know it's "D" because his aunt is ruminating on the fact that while she is amused by Tom's scheme to get out of his punishment, she knows that she has to punish/discipline him and "do her duty" by him so he grows up to be a good man.
The correct answer is actually D), not A.
Although these are independent clauses indeed, the punctuation in A,B, and C is not correct.
Before 'however' there needs to be a semicolon (;). And after however, you have to put a comma. Therefore D is the correct answer.
After a comma there needs to be a pause in reading. Does A sound correct to you if you make a pause before 'however' and not after it? Of course not.