Question

plausible has the same or almost the same meaning as:
enviable
marginal
credible
radical

Explanation:

"Plausible" means reasonable or believable. "Credible" also means believable or trustworthy. "Enviable" relates to being the object of envy. "Marginal" means minor or not central. "Radical" means extreme or fundamental - changing. So "credible" is the closest in meaning.

Answer:

C. credible