If a firm is seeking to enter a market via a wholly owned subsidiary where there are already well-established incumbent enterprises, and where global competitors are also interested in establishing a presence, a suitable mode of entry is a(n):

acquisition

Explanation:

Acquisition -  

In this case , when a specific company wishes or purchases , the shares of some other company which could be the partial shares or the complete shares , in order to control the company is known as acquisition .

If the company purchases more than 50% of the shares , which enables it to  make all the major decision of the company .

Hence , from the question information , the best method to enter into market would be via acquisition .

the answer to this question would be shared investment