Given below are two statements

Statement I: According to Classical Indian Logicians, all fallacies are material fallacies.

Statement II: According to Classical Indian Logicians, fallacies could be purely formal as well as purely informal.

In light of the above statements, choose the most appropriate answer from the options given below:

Correct option is D

Statement I: "According to Classical Indian Logicians, all fallacies are material fallacies."( Incorrect, Classical Indian Logicians (like the Naiyayikas) recognize both formal and material fallacies.
They categorize fallacies under Hetvabhasa (fallacies of reason), which include:
Formal fallacies (errors in logical structure)
Material/informal fallacies (errors due to content, relevance, etc.)
Statement II: "According to Classical Indian Logicians, fallacies could be purely formal as well as purely informal." (Correct, 
This aligns with Nyaya theory, where fallacies can be due to form (structure) or content (substance).
For example, the Hetvabhasas like Savyabhichara (inconclusive reason) are formal, while Asiddha (unproven reason) is informal.
Correct Answer: (D) Statement I is incorrect but Statement II is correct.