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Answer: C. No, but he is liable for another $2 per share.
Explanation:
A stock is not to be issued below its par value as this is the lowest price that it is to be issued at. If a par value is $4 for instance, the stock cannot be issued for anything less than this $4. 
In this scenario, the par value is $8 per share which means that Globule Inc. cannot issue this share for less than $8. Kirby in paying only $6, is still liable for $2 so that he can at least pay for the stock at its par value.