Arduino Kitchen Timer

#include <ArduinoBlue.h>

/*Jiko SmartV1 is a simple Kitchen Timer. 
 * Works with Arduino&bluetooth using an App installed in a phone.
 *First, connect App to Bluetooth. 
 *Arduino will activate Buzzer when timer is set.
 *Logs Tea = 5 - 6mins using Gas.
 *Meat - 25mins
 *Rice - 20mins
 *Ugali- 20mins
 *a - Tea
 *b - Meat
 *c - Rice
 *d - Ugali
 */
 #include <LiquidCrystal.h>
#include <Wire.h>
#include <hd44780.h>
#include <hd44780ioClass/hd44780_I2Cexp.h>
const int LCD_ROWS = 2;
const int LCD_COLS = 16;
 hd44780_I2Cexp lcd(0x20, I2Cexp_MCP23008,7,6,5,4,3,2,1,HIGH);

  
 int piezoPin= 2;
 int Tea = 300000; //5 mins //300000milliseconds
 int Meat = 1200000;//20 mins
 int Rice = 1080000; //18 mins
 int Ugali = 300000;//5mins  
 
 void setup(){
  Serial.begin(9600);
  pinMode(piezoPin, OUTPUT);
  lcd.begin(16, 2); 
  lcd.setCursor(3, 0);
  lcd.print("Jiko Smart");
}
 
void loop(){
  lcd.setCursor(1, 1);
 lcd.blink();  
lcd.print( "(Kitchen Timer)");
  if(Serial.available()>0)
  {
    char data = Serial.read();
    if (data == 'a')
    {
      delay(Tea);
      tone(piezoPin, 1000, 500);
  delay(1000);
      
    }
    else if(data == 'b')
    {
      delay(Meat);
      tone(piezoPin, 1000, 500);
delay(1000);
    }
    
    else (data == 'c');
    {
     tone(piezoPin, 1000, 500);
delay(1000);
    }
    
  if (data == 'd');
    {
      delay(Ugali);
      tone(piezoPin, 1000, 500); 
  //delay(1000);
  }}}