A. if only assumption I is implicit.
Feedback In this statement, the author concludes that the glittering thing is gold. His reason for this conclusion is that 'It glitters'. This points to the fact that the author of this statement opines that only gold glitters and no other thing glitters. This opinion of the author can also be said to be his assumption. Hence (I) is an assumption. (II) is not an assumption as it contradicts the author's view.