Need help with this Hw Question. Thank you

A report on the U.S. economy indicates that 28% of Americans have experienced difficulty in making mortgage payments. A news organization randomly sampled 400 Americans from 10 cities named the "fastest dying cities in the U.S." (Forbes Magazine, August 2008) and found that 136 reported such difficulty. Does this indicate that the problem is more severe among these cities? The correct value of the test statistic for testing this claim is O A. Z = 1.96 O B. Z = -2.67 O C. Z = 1.28 O D. Z = - 1.28 O E. Z =2.67