The answer: C
“As a matter of fact, my dog does know the difference between a treat and a vitamin.”
I hope this helps :)
1-shift in pronoun
2-neither
3-both
4-both
Don't give a repition of facts word for word.
you want your conclusion to be dynamic and natural. the reader must question himself/ herself and be able to comprehend what your subject was about.
1 make a strong claim , make it exaggerated, grab the readers attention
2 try and use new vocabulary