Answer: The event "d. an increase in the rate of immigration" can change the labor supply curve.
Explanation: when the production price increases, the labor demand curve shifts to the right.
When a technological advance is incorporated according to the type of technology, the demand curve can shift to the left or right.
An increase in the salary rate would result in a change in the amount of work offered because the amount of work an individual offers depends on the salary rate.
An increase in the immigration rate shifts the labor supply curve because it would imply that the number of people willing to work increases.