Answer: The correct option is
(C) Zero product property.
Step-by-step explanation: The given problem is
![(x+2)(x+6)=0~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~(i)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/w4cnryo7433wehbnl4z5obdpijj33ce072.png)
To conclude that x+2=0 or x+6=0, one must use which of the given properties.
We know that
for any two expressions E and F, we have
![EF=0~~~\Rightarrow E=0~\textup{or}~F=0.](https://img.qammunity.org/2020/formulas/mathematics/middle-school/7cv0k95h619z5n0fwjcwmqrenru9v3paio.png)
This property is known as Zero product property.
Therefore, to conclude x+2=0 or x+6=0 from the given problem (i), we must use the Zero product property.
Thus, (C) is the correct option.