The correct answer is C. "And when . . . death takes his master in its embrace and his body is laid in the cold ground, . . . there by his graveside will the noble dog be found, . . . "
Step-by-step explanation:
This text presents the reasons provided by George Graham Vest to explain the value of a dog. In this, Vest explains friends and people that might seem to be loyal can change over circumstances, but dogs are always loyal. One of the ideas to support this is that once its master is death the dog would still be loyal to him, this is explained in "And when . . . death takes his master in its embrace and his body is laid in the cold ground, . . . there by his graveside will the noble dog be found, . . . " which is one of the main ideas that help the reader conclude a dog would never leave its master.
Thus, it is option C the one that best supports this conclusion, also, other options only explain the disloyalty of people or do not explicitly show the close bond between a dog and its master.