Final answer:
The temperature in Mrs. Murphy's mom's freezer increased by 12 degrees, from -2 degrees to +10 degrees.
Step-by-step explanation:
The question is regarding a temperature change observed in Mrs. Murphy's mom's freezer, from -2 degrees to +10 degrees. The correct response that assesses this change is option (b), which states that the temperature has increased by 12 degrees. Mathematically, this is calculated by subtracting the initial temperature from the final temperature (+10 - (-2) = +12).