In an online setting, your voice and one is not heard communicating effectively shoes the way you mean for your statement or your writing. This way whatever you are communicating is not misconstrued.
C is the choice I would make because I believe the writer is planning to answer this question: "and how come we think dogs are so smart". The writer never tells us what dogs can't do (a) or mention others being dumb (b) and doesn't make fun of humans (d)
