【单选题】In a matrix of transition probabilities (where i equals the row number and j equals the column number),
A.
each number represents the conditional probability of being in state j in the next period given that it is currently in the state of i
B.
each number represents the probability that if something is in state i, it will go to state j in the next period
C.
the number in row 3, column 3 represents the probability that something will remain in state 3 from one period to the next
D.
the probabilities are usually determined empirically