The Term Pathogen Comes from Combining the Roots Path/o and Gen/o

The term pathogen comes from combining the roots path/o and gen/o. Which are the correct root and term definitions?

A) path/o (development, nourishment) + gen/o (generation, cause) = pathogen (development or nourishment of the cause)
B) path/o (development, nourishment) + gen/o (suffering, disease) = pathogen (development or nourishment of the suffering/disease)
C) path/o (generation, cause) + gen/o (suffering, disease) = pathogen (generation/cause of the suffering/disease)
D) path/o (suffering, disease) + gen/o (development, nourishment) = pathogen (development or nourishment of the suffering/disease)
E) path/o (suffering, disease) + gen/o (generation, cause) = pathogen (generation/cause of the suffering/disease)