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Read this word problem.$\newline$On a cold February morning, Colton checked the temperature on his phone and saw that it was $-3 \, ^{\circ}\mathrm{C}$. When he checked again after school, the temperature had dropped $3 \, ^{\circ}\mathrm{C}$. What was the temperature after school?$\newline$To solve the problem, Ellen subtracted $-3 - (-3)$ and came up with an answer of $0 \, ^{\circ}\mathrm{C}$. Is Ellen correct? Why or why not?$\newline$$\newline$Choices:$\newline$(A) Yes, Ellen is correct.$\newline$(B) No. Ellen should have added $-3 + 3$ because she needed to add the starting temperature and the change in temperature.$\newline$(C) No. Ellen should have subtracted $-3 - 3$ because the temperature started at $-3 \, ^{\circ}\mathrm{C}$ and dropped $3 \, ^{\circ}\mathrm{C}$.