The correct option is C lots of
"CD" is a countable noun. "Much" and "Little" are used for uncountable nouns. Thus, option A and B can be eliminated. For understanding the usage of "a few", we need to understand the difference between "few" and "a few". Few is used to describe a very small amount and "a few" is used to describe an amount which is more than the small amount but not a lot. A lot of and lots of are used to express that there is a large quantity of something. Th number mentioned here for CD's is a huge quantity (100). Thus, option D is the correct answer.