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b) Ask Mr. Li for an assistant as you are not able to manage the workload

This isn't such a good idea as Mr. Li might percieve your request as a complaint. You would have thrown away all your chances with him. It is better to act with caution and start emphasising the positive aspects. Afterwards you could describe the difficulties and ask Mr. li for his opinion. Eventually you should turn the conversation to your problem abd suggest your solution.

As the head of the company, Mr. Li decides whether you need an assistant or not. You shouldn't deal with the topic in advance. For instance, you could casually mention that you had an assistant while working for another company whereby you were able to finish your work faster. However, you should approach the whole conversation deliberately in order to avoid that Mr. Li feels critizised and could lead to the loss of the job.