Answer:
correct option is here B. About 14.3 
Step-by-step explanation:
given data 
running sum of forecast errors RSFE = 500
mean absolute deviation MAD = 35
solution
we get here tracking signal that is express here as
tracking signal = 
 .................................1
 .................................1
put here value and we will get tracking signal 
tracking signal = 

tracking signal = 14.3 
so correct option is here B. About 14.3