Consider the Following Code Snippet

Consider the following code snippet. What is the potential problem with the if statement? double average;
Average = (g1 + g2 + g3 + g4) / 4.0;
If (average == 90.0)
{
System.out.println("You earned an A in the class!") ;
}

A) Using == to test the double variable average for equality is error-prone.
B) The conditional will not evaluate to a Boolean value.
C) The assignment operator should not be used within an if-statement conditional.
D) Literals should never be used in if statement conditionals.