need / come / to / class / explain / teacher / sit / at / through / the / home / not /and / may / lesson / to / us/ the / Internet lour / he

• A. 
  Our teacher may sit at home and explain the lesson to us. He need not come to class through the Internet.
• B. 
  Our teacher need not come to class. He may explain the lesson to us through the Internet and sit at home.
• C. 
  Our teacher need not come to class. He may sit at home and explain the lesson to us through the Internet.
• D. 
  Our teacher need not come to class he may sit at home and explain the lesson to us through the Internet.