This is a chain of logical sequence. From my perspective, to deal with these chain, we should translate and combine separate single conditions into ONE big conditional chain.
Let's translate one by one:
- Flourish is essential to success (essential = necessary indicator => which mean you can say: Flourish is necessary for a successful economy)
Success -> Flourish (1)
- Flourish requires young people excite (requires = necessary indicator)
Flourish-> Excite (2)
- Good communication is necessary to these excitement, aka young people's excitement ( another necessary indicator)
Excite ->good com (3)
Combining three conditions (1), (2), and (3), we have a big chain condition as following:
Success -> Flourish -> Excite -> Good Com
you can play with any two of these element in their contrapositive form. "
For example, from "Success -> Good Com", we can have "Not good Com -> Not Success", which is exactly what option C say

.
Or another example, "Success -> Excite", we can infer that "Not Excite -> Not success
One tip to translate these chain is that you should actively ask "What is essential? What is required?"
(necessary element)
Then put them in this sequence [If SUFFICIENT -> Then NECESSARY]
This translation requires some dedication to master. For further reference, I highly recommend that you purchase 7Sage LSAT course and a subscription of LSAT Practice Test Bundle from LSAC in case you need extra practice.
I'm not an expert and this is just my personal view. Please do your own research