Final answer:
The horizontal axis in a coordinate graph is called the x-axis, representing the independent variable, while the vertical axis is the y-axis, representing the dependent variable. Hence the correct answer is option B
Step-by-step explanation:
The horizontal axis in a coordinate graph is called the x-axis. It is the independent variable and is usually represented by the letter x. The vertical axis is called the y-axis and is the dependent variable, typically represented by the letter y. The x-axis is used to represent values along the horizontal direction, while the y-axis is used to represent values along the vertical direction.
Hence the correct answer is option B