Download the apk from here and continue. Download the 1.8.0 version.
1 After downloading the file, install it on your phone
2 Select supersu from option and select 1st exploit ie. BOROMIR
3 You will get success, reboot the phone and your phone is rooted.
4 If you don't believe download root checker from playstore and check
This is the safest and easiest method. Don't forget to say thanks, I am new to xda.
I am not responsible for any consequences to the phone arising from using this educational guide.