Hg Company is the largest meat processing enterprise in China.

In line with the meaning of the question, Shuanghui International Holdings Limited's acquisition of Smithfield Food Company in the United States can promote Shuanghui International to become a larger multinational company;

② In line with the meaning of the question, Shuanghui International is the largest meat processing enterprise in China and the largest meat listed company. Smithfield Foods, founded in 1936, is the world's largest producer of live pigs and pork. This acquisition can improve Shuanghui International's industrial chain and enhance its brand.

(3) According to the meaning of the question, Smithfield Food Company is the world's largest producer of pigs and pork, and Shuanghui International's acquisition of American food companies may have an impact on domestic production and sales;

Doesn't matter. Overseas acquisition belongs to "going out" strategy, not "bringing in".

Therefore, choose a in this question.