Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R):

Assertion (A): Business accelerators are set up with the primary objective to offer mentorship and resources to speed up the growth of startups.
Reason (R): Most of the startups face difficulties and challenges in their growth stage.

In light of the above statements, choose the most appropriate answer from the options given below:

The assertion (A) provides us with the fact that business accelerators are set up with the primary objective of offering mentorship and resources to speed up the growth of startups. The fact that business accelerators are making investments in the growth of startups hints towards two things being the reasons why the planners would have gone ahead with the accelerators:

1. They believe that the startups need help.
2. They are hopeful that these startups might succeed.

The reason (R) is a reasonable explanation for the two points listed above. It explains that the startups need help because they face difficulties and challenges in their growth stage. It also explains that planners can probabilistically hope for success because 'most' startups face such challenges.

Therefore, reason (R) is the correct explanation for assertion (A) and option A is the correct answer.