Hello, I would like the answer to this question please.

In examining the factors that determine the average length of stay in a hospital across states, you collect data on the following variables. Y = statewide average hospital stay X1 = median state income X2 = 1 if the state is in the Northeast, 0 otherwise X3 = 1 if the state is in the South, 0 otherwise X4 = 1 if the state is in the Midwest, 0 otherwise X5 = 1 if the state is in the West, 0 otherwise You run the following regression Y = Bo + $1X1 + 82X2 + 83X3 + 34X4, where the variable X5 is omitted from the regression (ie, it is treated as the base case). What is the additional length of stay that can be attributed to being from a state in the South? O a. B3 + Bo O b. Unable to tell with the information given. O c. B3 O d. B3 - B2 + Bo