What present-tense form of the verb ensenar (~ mark on second n) would you use to speak about yourself?

Question

a. ensena (~ mark on second n)
b. ensenas (~ mark on second n)
c. enseno (~ mark on second n)
d. ensenamos (~ mark on second n)

Answer 1

c, c, enseño, señor.

tilde =n and alt, followed by typing the n in.

Answer 2

C enseno