Consider the following electron configurations. Element A: 1s² 2s¹, Element B: 1s² 2s² 2p⁶ 3s¹, Element C: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹. Which of the following is the correct order for decreasing IE1 (i.e., largest to smallest)?

a) A > B > C
b) C > B > A
c) B > C > A
d) C > A > B

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