Relay not functioning

const int buttonPin = 3;    // pin to read button
const int mode1 = 4;       // relay 1
const int mode2 = 8;     // relay 2
const int mode3 = 2;       // relay 3
const int mode4 = 7;     // relay 4
int yay = 0;            //using this because I have no idea what im doing
int D = 0;           //using to test button
int B = 0;           // total # of button presses

void setup()
{
Serial.begin(9600);
  pinMode(buttonPin, INPUT);
   pinMode(mode1, OUTPUT);
    pinMode(mode2, OUTPUT);
     pinMode(mode3, OUTPUT);
      pinMode(mode4, OUTPUT);

}

void loop()
{
  D = digitalRead(buttonPin);
  // if button is pressed
  if( digitalRead(buttonPin) ) {

    // increment count
    yay = ++B;
    // debounce
    delay(200);
    if(B == 4) {

 switch (yay) {
   case 0:
      digitalWrite(mode1, HIGH);
      break;
   case 1:
      digitalWrite(mode2, HIGH);
     break;
    case 2:
      digitalWrite(mode3, HIGH);
     break;
     case 3:
      digitalWrite(mode4, HIGH);
      break;
  default:
  B = 0;


 }
    }
  Serial.print(B);
Serial.print("\t");
 Serial.print(yay);
Serial.print("\t");
Serial.println(digitalRead(mode1));

}
}