Review the conclusion

Significant efforts were made by individual citizens to assist jewish children in Nazi-occupied territories. Which evidence from "Letter of Concern" best supports this conclusion.

A. It is a letter written from an ordinary English citizen, J.H. Harker, to the British foreign secretary, Lord Halifax.

B. The letter describes the conditions of Jewish refugee camps in Britain.

C. The letter is written by the British foreign secretary and is addressed to an ordinary English citizen, J.H. Harker.

D. The letter is dated October 31, 1938.