Assume d is a price stock series what is going to be stock returns from the SHORT perspective expressed in python? ( time series in an ascending order) diff(d) is a function that takes difference of two consecutive numbers in an array ( 1,2,3,5 )---> diff(d) is (1,1,2)

A) -diff(d)/d[1:(length(d)-1)]

B) diff(d)/d[1:(length(d)-1)]

C) d[1:(length(d)-1)]/diff(d)

D) none of the above