Premise 1: easier to use public domain characters, MORE people use them
Premise 2: public domain characters are cheaper than copyrighted characters
Conclusion: removing limitation on public character, art producing cost is lower
A: Removing limitation needs to result more people using public domain characters. More people using public domain suggests a lower cost. Otherwise, the cost would remain unchanged if the % of people using public domain characters stay the same. CORRECT!
B: The total volume of artwork produced by the industry has not been discussed. The conclusion focuses on the COST of producing the artwork.
C: If public domain characters of significant culture costs more to produce, removing the limitation may increase the cost of producing the artwork using public domain characters
D: Even if the cost of producing copyrighted characters does not cost less to produce, the cost of producing artwork still could be lower if there are more people producing art featuring public domain characters that cost less.
E: The prompt says more artists will use them (a relative increase), but "more" doesn't necessarily mean "most" (an absolute majority of 50%+). It could just mean an increase from 5% to 10% of artists