How would I answer this?

Question 6 (1 point) The amount of money that Justin earns in a week is a random variable with a mean of $980 and a standard deviation of $25. The amount of money that Elara earns in a week is a random variable with a mean of $800 and a standard deviation of $10. You would like to use a Normal model to determine the probability that Justin's weekly income is at least $233.85 more than Elara's weekly income (the probability that the difference M-E is at least $233.85). Which of the following assumptions are needed? A: Justin's weekly earnings are independent of Elara's weekly earnings. B: Justin's weekly earnings and Elara's weekly earnings follow a Normal model. C: Justin's weekly earnings are greater than Elara's weekly earnings OB only O A and C O A and B O A only