China’s regulators are targeting foreign firms, a majority of respondents said in a survey by an American business lobby, citing protectionism among the top concerns for their operations in the world’s second largest economy. Fifty-seven percent of the 477 respondents included in an annual survey by the American Chamber of Commerce in China said they believed recent government investigations “singled out” foreign companies. The survey results, published on Wednesday, also said increasing protectionism had become the fifth greatest concern for businesses in China for the first time since 2010.