If ' b ' ever becomes -2 or 4 , then the denominator of the fraction
becomes zero.
You and I both know that a fraction means division, and division by zero
is not allowed.
If ' b ' ever becomes -2 or 4, you can't calculate the value of the fraction.
' C ' is the correct choice.
In the future, please quit posting exam questions for other people to answer.
Even if it's correct, and you fill it in on the exam, and you get credit for it,
you haven't learned anything and you've made a cheater out of yourself.
You shouldn't feel good about that.
