Step 1: Understanding the Question:
This question tests knowledge of floriculture in India.
Step 2: Detailed Explanation:
Tamil Nadu is the largest producer of annual flowers' seeds in India.
It is a major centre for seed production of flowers like marigold, aster, and zinnia.
Punjab (A): Not the largest producer.
Karnataka (B): Known for cut flowers, not seeds.
Kerala (D): Not the largest producer.
Thus, Tamil Nadu is the correct answer.
Step 3: Final Answer:
Thus, Tamil Nadu is the largest producer of annual flowers' seeds, which corresponds to option (C).
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