Which of the following inscriptions mentions the Mahabharata as a Satasahasri Samhita?

Correct option is C

The correct inscription is: Khoh Copper-plate of Maharaja Sarvanatha, Year 214

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The term Satasahasri Samhita literally means "the collection of one hundred thousand [verses]," referring to the approximately 100,000 shlokas (couplets) contained in the final version of the Mahabharata.
The Khoh Copper-plate Inscription of Maharaja Sarvanatha, dated in the Gupta era year 214 (which corresponds to A.D. 533-534), mentions a land grant given by the king.
In the context of this grant, the inscription explicitly refers to the Mahabharata as the Sata-sahasri-Samhita (Śata-sāhasrī-Saṃhitā).

This record provides crucial epigraphic evidence, confirming that by the first half of the 6th century CE (Gupta/Post-Gupta period), the epic had been expanded and was universally recognized by its final name, indicating the full and final compilation of the text.