The substance that contains a lot of sodium and chlorine from the options is A. Seawater.
There are several substance in seawater including:
As a result of the abundance of sodium and chlorine in seawater, a lot of sodium chloride forms which is a salt and explains why seawater is known to be very salty.
In conclusion, option A is correct.
Find out more about salt in seawater at https://brainly.com/question/2187100.
