Step 1: Understanding the Question:
• The question asks who said that Tattvajnana is achieved by practising Yoga, just as expertise in texts comes from practising the letters.
Step 2: Detailed Explanation:
• As per the NTA final answer key, this statement is attributed to Gheranda.
Step 3: Final Answer:
The correct option is (A) Gheranda, as per the NTA final answer key.