Answer:
C. Printing press.
Step-by-step explanation:
As seen in the given passage, Mr. Tan's business is in the printing press sector. He has been in the business for some years now.
The passage talks about how Mr. Tan's printing press business was not too profitable during the initial years. This was because of his use of the traditional way of printing. But with the advanced modern technology, his business boomed, bringing him more profit and lessening the workload.
Thus, the correct answer is option C.