Answer:
B.
Step-by-step explanation:
The passage specifically mentions that "In natural condition,'' with this information we can use the process of elimination.
A is incorrect, how can humans genetically engineer an animal that has been in the wild its whole life.
C. is incorrect, the shape of this dog, nay any animal can not change in one generation. If this had happened the dog would be considered having a disability.
D. is incorrect, again how could humans interfere and breed dogs if they have not had any human contact. unless they cross bread, which is very unlikely, due to the descendants of this specific breed, and their location in the globe.
with all of this information it is safe to assume that option B is correct; most likely the ancestors of this dog became used to not running and easily finding food so the dog had a beneficial mutation, where it got rid of a body part it did not need, like long legs, but kept or enhanced things it needed like a long nose.
hope this helped :)