Sergei had to decide among watching a two-hour movie with a cost of $20, buying a book to read for $10 that would take about four hours to read, and going to a three-hour concert for $30. If he considers the benefit of each situation to be proportional to the amount of time, with a value of about $50 per hour, what is the opportunity cost of the best decision?(1 point)

• $150
• $80
• $120
• $190