Answer:
The answer to this question is given below in the explanation section.
Step-by-step explanation:
 The correct option to this question is:
.clr{color:blue;}
I write the complete code of HTML using this CSS style to execute this scenario as given below 
<html> 
<head> 
<style> 
 
.clr 
{ 
 color:blue; 
} 
 
</style> 
</head> 
<body> 
 
 
<a href="pg.html">click here</a> 
<h2>Home</h2> 
 
</body> 
</html> 
The bold text is a complete code of this question. When you will run it it will execute a link and Home text on the page in blue color. So the correct option is .clr{color:blue;}