Which is the most appropriate statement?

a. Risk has no real form unless we relate it to our own direction, that is, what we are trying to achieve.

b. Risk has no real form unless we relate it to known hazards, that is, what we are trying to achieve.

c. Risk has no real form unless we relate it to our own direction, that is, what we are trying to avoid.

d. Risk has no real form unless we relate it to our own direction, that is, what we are certain to achieve.