Read the statements given below.

A. Azotobacter can fix atmospheric nitrogen while living freely in the soil.

B. Methanogens are aerobic bacteria.

C. Streptokinase is produced by a fungus.

D. Primary treatment of sewage waste involves filtration and sedimentation.

Which of these statements are wrong?

• A

  A and B

• B

  B and C

• C

  C and D

• D

  A and D