Challenge question : Why is the output 5

Question

I came across this challenge question.
The answer is 5;
Why is the answer 5 and not 4;

Test() is the constructor, so after it the Test-object is created, a will be assigned to 3 and then be incremented to 4 ?

static void Main(string[] args)
{
Test t = new Test();
Console.Write(t.a);
}

public class Test
{
public int a=5;
public Test()
{
int a = 3;
a++;
}
}

Answer 1

int a = 3; creates a new int primitive and does not references the one in the Test class (3 lines above)

if you were to replace
int a = 3;
with
this.a = 3;

you then would get a result of 4 as it will reference the a primitive of the class and won't be a new one

so when you call the Console.Write method, you actually print the public int a = 5; which never changed.

Answer 2

I guess "t.a" means calling the property not the local variable inside the constructor.