What is the result of continuous self-pollination?

Given below are two statements.
Statement $I$: Self-incompatibility is a device that prevents outbreeding.
Statement $II$: Self-incompatibility is a genetic mechanism due to which germination of pollen on the stigma of the same flower is inhibited.
In the light of the above two statements,choose the correct answer from the options given below.

In papaya,male and female flowers are present on different plants. This condition permits:

Both autogamy and geitonogamy can be prevented in

In which plants do outbreeding devices prevent autogamy but not geitonogamy?

Which one of the following usually does $NOT$ promote self-pollination?