- Clostridium butylicum: Generates butyric acid.
- Aspergillus niger: Generates citric acid.
- Acetobacter aceti: Generates acetic acid.
- Lactobacillus: Generates lactic acid.
The correct correspondence is:
(A) - (I), (B) - (II), (C) - (III), (D) - (IV).
Final Answer:
\[
\boxed{\text{The correct correspondence is (A) - (I), (B) - (II), (C) - (III), (D) - (IV).}}
\]