Answer:
b. Both the equilibrium wage and quantity decrease.
Step-by-step explanation:
When a market is in equilibrium, quantity supplied equals quantity demanded.
When swimming pools adopt labour saving technology, the quantity of labour demanded falls. This leads to a decrease in equilibrium wage and quantity . When supply exceeds demand, wages fall and labour would leave the lifeguard industry due to decreased demand.
Check out the attached image for a graphical explanation
I hope my answer helps you.