Use the Following Information for Questions

Multiple Choice

Use the following information for questions:
In a report by Reuters, the headline read "Emotional Support Helps Breast Cancer Survival" The headline was based on a study of 847 women (442 black women and 405 white women) with breast cancer and how they fared over a 9-year period. The authors wrote "Women in our study who reported low levels of both emotional expression and emotional support experienced 2 to 4 times greater breast cancer mortality than women reporting high levels of both".
-The conservative margin of error for the sample of 847 women is

A) 0.1%.
B) 3.4%.
C) 4.0%.
D) none of the above.