Iwill give brainliest to who ever is correct !
one essential feature of the normal distribution is that its graph is

a)
skewed.

b)
bell shaped.

c)
inverted v-shaped

d)
bimodal (two-humped).

unique mode, the mean, and median are all equal to mu
-inflection points between mu and sigma (concave) and convex everywhere else 
-gives us a bell-shaped curve
so option B

I believe the correct answer is option B. One important characteristic of a normal distribution would be that its graph is in a bell-shaped. Another name of this distribution is the Gaussian distribution. Hope this answers the question. Have a nice day.