GKFix MCQ Question

What is the electronic configuration of the element with atomic number 91 (Protactinium)?

• A. [Rn] 5f^3 7s^2
• B. [Rn] 5f^2 6d^1 7s^2
• C. [Rn] 5f^1 6d^2 7s^2
• D. [Rn] 5f^4 7s^1