<h2>Answer:</h2>
<u>The right option is</u><u> (B) S orbital</u>
<h2>Explanation:</h2>
Each orbital can hold two electrons. One spin-up and one spin-down. The first principal energy level contains only an s sublevel; therefore, it can hold a maximum of two electrons.
The order in which the orbitals are filled is given below
1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p, 8s
