If A and B are two sets such that A has 40 elements, 𝐴 ∪ 𝐵 has 60 elements, and 𝐴 ∩ 𝐵 has 10 elements, how many elements does B have?

• A. 40
• B. 30
• C. 25
• D. 45

• 30

Please select one of the options to reveal the correct answer.