Which of the Following Is True About Anaerobic Metabolism

Which of the following is true about anaerobic metabolism?
1) It can cause metabolic alkalosis.
2) It results in excess lactate production.
3) It results in excess production of carbon dioxide.
4) It is a very inefficient method of producing ATP.

A) 2 and 4
B) 1 and 3
C) 1, 2, and 3
D) 2, 3, and 4