C
It is not true that Jesus is the only teacher. In fact, there are many words and many occurrences of the words teacher (59 times), teaching (51 times) and "I teach" (97 times) for a total of 207 times in the New Testament. For example, none of these passages are about Jesus, but rather those who are called to teach:
"Not many of you should become teachers, my brothers, for you know that we who teach will be judged with greater strictness. For we all stumble in many ways. And if anyone does not stumble in what he says, he is a perfect man, able also to bridle his whole body." James 3:1-2
Hebrews 5:12 ¶ For when for the time ye ought to be teachers, ye have need that one teach you again which be the first principles of the oracles of God; and are become such as have need of milk, and not of strong meat.
Hebrews 5:13 For every one that useth milk is unskilful in the word of righteousness: for he is a babe.
Hebrews 5:14 But strong meat belongeth to them that are of full age, even those who by reason of use have their senses exercised to discern both good and evil.
My feeling is we are responsible because to whom much is given, much more is required.
James 4:17 Therefore to him that knoweth to do good, and doeth it not, to him it is sin.
If I can make the world a little better by teaching, shouldn't I do some good or should I self preserve myself by not being many teachers?
Jesus said the answer to that, I believe:
Matthew 16:25 For whosoever will save his life shall lose it: and whosoever will lose his life for my sake shall find it.
Yes, we will be held to a higher standard and judged.