At first glance it might seem that the "a = 3, b = 0" answer choice is correct, since static fields are initialized in order of their declaration and not initialized value of a is assigned to the b field.
In fact, since the a field is a constant, then compiler immediately substitutes its value. I. e. first line compiles as
static int b = 3;
and the answer correct answer "a = 3, b = 3" is correct.