JS adding numbers understanding help

Question

I was trying to challenge my self to make a quiz that tells you your score at the end.
But I didn't know how to add them.
HTML: option
A
B
C ✔️correct answer
D
What I did was
var x = 0;
C.onclick = func...{
x+=1;
score.innerHTML = x
}
But that just keeps adding up the score number by one every time you click on the correct answer.
So how can I limit it to add one (1) only?
::pretend like there are 5 questions.

I need to add up the scores correctly.
If correct answer clicked, add 1, if not, -1 or -0

Answer 1

https://www.sololearn.com/post/129872/?ref=app

the modern ui is clicking answer and then next question is shown, like what you are trying to do. i remember ashutosh has some maths mc quiz with user experience like this.

we will proceed little by little and try to do that in #6 of this series.

meanwhile, let's learn the basics :

document.querySelectorAll

with class names or tag names

Answer 2

I have started a code, but it only has 1 question.
But if it's easier to work with the code, then I will finish it to 5 questions, (ur preference).