Don’t trust anyone even your shadow leaves you when it’s dark
Explanation:

FIVE TIPS TO HELP YOUR DENTAL RECEPTIONIST WHEN CALLING YOUR PATIENTS
- Sit up straight and smile before each call. ...
- Let patients speak without interruption or placing them on hold. ...
- Be well versed in practice FAQ's and always have a script handy. ...
- Probe for more information. ...
<h3>-XxItzAdiXx</h3>
To be really honest, I think its a matter of opinion on which sentence is the strongest conclusion. To me, I think choice C is the best answer because it paints the contrast between the dog's wild instincts versus loyalty. I guess the conclusion should also mention that despite the abuse, Buck still learned to trust a human (even though one could easily understand why the dog would never trust a human after the abuse), so it shows just how powerful loyalty can be.