challenge: What advice did Jiang Taigong give to King Wu before attacking the King of Shang?
  
  A. To negotiate a peace treaty with the King of Shang
  B. To wait for the appropriate opportunity to eliminate the King of Shang
  C. To attack immediately, while the King of Shang was still powerful
  D. To abandon the plan to overthrow the King of Shang
  Answer: 