By the early 2000s, which country was taiwan's third-largest trading partner? a. south korea
b. china
c. japan
d. united states

(B) China

Explanation:

China has become the Taiwan's third largest trading partner by early 2000s. It is one of the source of large trading surplus. As, the china was one of the famous destination in terms of the outward investment from the Taiwan.

The china replaced United states (US) as one of the largest market of export in the year 2002. In the mid of 1990, the Taiwanese Enterprise become the large capital and the technology intensity so that they can easily locate the manufacturing in the china for exporting purpose.

Therefore,Option (B) is correct. 

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