Step-by-step Solution:

The sequence is 20, 32, 45, 59, 74, ...

Differences between consecutive terms:

• 32 - 20 = 12
• 45 - 32 = 13
• 59 - 45 = 14
• 74 - 59 = 15

The differences increase by 1 each time, so the next difference is 15 + 1 = 16.

The next term is 74 + 16 = 90.

Answer: (B) 90