There are many assumptions in this question but the author is trying to convince us that either existing jobs will not create any new positions OR the new start up companies will not have bigger # positions that previous start ups.
C. This year, the new companies starting up will not provide substantially more jobs per company than did new companies last year.
Lets say last year there were 5 start up companies with 2 positions each so last year we have 10 new jobs.
but this year we have only one start up company that will hire 11 people!
So Correct answer is C, you can also negate this answer and check whether it weakens the conclusion
This year, the new companies starting up will provide substantially more jobs per company than did new companies last year
LGTCH
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