How to evaluate the return of (if condition) when using multiple logic operators and integers

Question

While competing with a friend using (c language) here on sololearn, there wa this question:

What's the output of this code?
If (1 && 1 && 1 || 0)
printf("a");
else
printf("b");

The solution was "a".. Now I don't know what the condition returned nor why the first was chosen. Can anyone help me understand this?

Answer 1

1 && 1 -> true
true && 1 -> true
true || 0 -> true