Final answer:
To find the solution to the inequality y<1.9, we need to check each number option to see if it is less than 1.9. Option number C is correct.
Step-by-step explanation:
The inequality y<1.9 means that y is less than 1.9. To find which number is a solution of this inequality, we need to check each option.
A) 2.0 is not less than 1.9, so it is not a solution.
B) 1.8 is less than 1.9, so it is a solution.
C) 1.9 is not less than 1.9, it is equal to 1.9, so it is not a solution.
D) 1.5 is less than 1.9, so it is a solution.
Therefore, the numbers that are solutions of the inequality y<1.9 are B) 1.8 and D) 1.5.