Answer:
The correct answer is B. 0.8907.
If z is a standard normal variable, it follows a normal distribution with a mean of 0 and a standard deviation of 1. This means that the probability of z being less than 1.13 can be found by looking up the corresponding z-score in a standard normal table, which shows the probabilities for different values of a standard normal variable.
The probability of z being less than 1.13 is 0.8907, which is the probability associated with the z-score of 1.13 in a standard normal table. This is the correct answer, so the answer is B.