Answer: The answer is (b) 100° C.
Step-by-step explanation: Given that Bobby's mom sets a small small pot of water on the stove and lights the burner, which after ten minutes bobby notices boiling. We nee to choose the correct temperature of the water among the four given options.
We know very well the freezing and boiling point of water, which are 0° C and 100° C. And at 100° C, the water starts vapourising.
Since the water was boiling when Bobby notices the pot, so the temperature of the pot must be 100° C.
Thus, the correct option is (b) 100° C.