Select from options: Continue writing the next sentence.

How to add hot tub chemicals
Test your water's total alkalinity.
When you fill up your hot tub you need to check the alkalinity of the water. You may even want to repeat this twice per week.

Available choices:
a). To do this you first need to read your personal user manual. Some hot tubs have an alkalinity assist meter located close to the water's pitcher.
b). To test your water's alkalinity a bit, submerge your measuring cup in the water and let it cool. If your water is considered too hot, it could burn your fingers.
c). The goal is to establish how alkaline your water is. This needs to stay between 80 and 120ppm.
d). This test checks the ph of the water, which can help determine if your water is too hot to add any chemicals. Turn on the faucet or shut off your water.
Answer:
c).