Why would you like to change the company?

1) I am looking for a more challenging career in a firm with a larger employee base such as yours.

2) Keeping in mind my career goals, the time has come for me to move onto the next rung of 

the ladder and make a mark for myself. This can be achieved in a company like this.

3) It is just a career move to enhance my knowledge in my own area of interest. After completion of this question only interview will go for further questions

ETC