Answer:
B. "madness had its own logic" (paragraph 7)
Step-by-step explanation:
In part A, reasonable is the synonym of plausible. The statement mentions that madness seemed plausible and that the Jews had to go about killing women and children alike in the most horrendous ways. The statement, "madness had its own logic," supports this answer.
All the problems that were going on then seemed logical and reasonable for them. It was accepted as the new normal. Therefore, all the cruelty went on unabated.