Hithank you for using this site. Is this a math or stat-related question?
Oh, I am sorry, I am a math expert, I will just opt out so that marketing experts can immediately help you
The question is worded in such a way that the answer could be either (1) stage one, "development," or (2) stage two "introduction."
The problem with this very badly written question is broad pronoun reference.
Where the question says "Based on THIS description ..." the pronoun, THIS, could be referring to the mention of the show's premier (when the show moved from stage 1, development, to stage 2, introduction) OR it could be referring to the marketing of the show that was going on PRIOR to the first show. which would clearly be stage 1, development.
If you believe that the "description being referred to IS indeed the pre-show marketing, then the answer is in deed stage 1; Development.
The development stage is the period from idea until the product is released to the market.
Introduction is the phase during which a product is launched into the market.
Given that the most previous stage referred to by "this," (previous sentence in the question) was the pre-show marketing AND that one could read the first sentence where the first show was mentioned ass background, or context, I would answer stage 1, development.