Final answer:
Sam earned $120 last week.
Step-by-step explanation:
To calculate how much Sam earned last week, we can multiply her hourly rate by the number of hours she worked. In this case, Sam earns $12 per hour and she worked for 10 hours.
To find her total earnings, we can use the formula: Total earnings = Hourly rate x Number of hours
So, Sam's total earnings last week would be $12 x 10 = $120.
Therefore, the correct answer is B) $120.