1. _ is one of the most useful and fascinating divisions of human knowledge is widely accepted. A. What mathematics B. Where mathematics C. Mathematics D. That mathematics2. _ is of no consequence to me. A. He goes or stays B. That he goes or staysC. Whether he goes or stays D. If he goes or stays3. _ knows the truth will tell you about it.A. Who that B. Whoever C. That that D. Those who4. _ was not the way