Why does Willy decide to kill himself?

• A. he can leave a lot of insurance money to biff if his death looks like an accident. then biff will have a chance to be successful.
• B. he would rather die than face linda about his past indiscretions.
• C. he is drunk and doesn't realize what he is doing.
• D. he knew he had incurable cancer and didn't want to spend the rest of his life in pain.