Answer:
The answer is C. Assets increase and stockholders' equity increases
Step-by-step explanation:
For Carl and Stefanie, their asset(cash) has been increased by $15,000. Probably this cash will be put in the bank. If any one of the wants to pull out of the business, he can collect his money back.
Also, equity (capital) will also increase by the number of shares this $15,000 can obtain.
All the other options were wrong because there is no liability in this transaction.