According to Nyaya, which means of knowledge (pramana) is used in the following argument: 'The world is an effect and hence it must have an efficient cause like all objects, e.g. pots, cloth, etc. do; that efficient cause is God'?

The knowledge here is gained by inference, anumana, using an invariable relation and an example.

The world is observed to be an effect, a produced thing.

A universal relation holds that whatever is an effect has an efficient cause, as pots and cloth show.

Applying this pervasion to the world yields that it too must have an efficient cause.

Reasoning from a mark through a universal to a conclusion is anumana.