完形填空，需要帮助：

New forms of international management have not been studied very much in their own right—for example,             on the use of accounting and other information to evaluate performance.

A. little research has been undertaken

B. a little research has been undertaken

C. much research has been done

D. they have undertaken the research

此题选择哪个选项？怎么理解句意呢？尤其是in their own right。