Question

refer to the image. on which line does the class selector begin?
body {
font-family: segoe ui, tahoma, sans-serif;
background-color: #fab66b
}
p {
color: navy;
}
.sale {
font-weight: bold;
background-color: aqua;
}

Explanation:

In CSS, a class selector is denoted by a . followed by the class name. Looking at the code, on line 8, we see .sale {, which is the start of a class selector for the class named "sale".

Answer:

Line 8