What is the general electronic configuration of lanthanoids?

• A
  $[Xe] \, 4f^{1-10} \, 5d^{0-1} \, 6s^2$
• B
  $[Xe] \, 4f^{1-14} \, 5d^{0-1} \, 6s^2$
• C
  $[Xe] \, 4f^{0-14} \, 5d^{0-1} \, 6s^2$
• D
  $[Xe] \, 4f^{1-14} \, 5d^{0-1} \, 6s^{1-2}$