Final answer:
E. N. Bell's specific missionary policy is not detailed in the provided references, therefore, the answer cannot be accurately given based on the available information. Further historical research on E. N. Bell and his associations would be necessary to determine his missionary policy.
Step-by-step explanation:
The statement that best describes E. N. Bell's missionary policy is not specifically provided in the historical references given, which focus on different periods and regions where missionary policies varied. In the context of missionary activities, policies often included elements of cultural assimilation, whether through education, language instruction, or conversion to Christianity, along with social and economic reforms. If E. N. Bell was associated with a specific missionary policy or organization, additional historical research on him would be required to provide an accurate statement regarding his policy.