Final answer:
The correct punctuation for the sentences is explained.
Step-by-step explanation:
The correctly punctuated sentences are:
1. As a result, Chinese banks have had more money. They have been able to fund investments in business and infrastructure.
2. As a result, Chinese banks have had more money, so they have been able to fund investments in business and infrastructure.
3. As a result, Chinese banks have had more money, and so they have been able to fund investments in business and infrastructure.
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