Answer:
Option b which is 
Step-by-step explanation:
We have been given the discriminant 12
We have to choose the equation which will satisfy the given discriminant.
We will consider all the given equation one by one
First we will take option a which is 
Discriminant from the equation we will find by the formula

Here, a=-1,b=8 and c=2 on substituting the values we will get

Hence, option a is incorrect.
Now, we will consider option b which is 
Here, a=2,b=6 and c=3 on substituting the values we get

Hence, option b is correct
Therefore, option b is the required answer.