JEE Main 2023 Chemistry question

What is the number of unpaired electron(s) in the highest occupied molecular orbital of the following species: ; ; O ; ?

• (A)0, 1, 0, 1
• (B)0, 1, 2, 1Correct
• (C)2, 1, 2, 1
• (D)2, 1, 0, 1