Concept: The Hijrah calendar contains twelve months, and every religious duty is tied to a fixed month.
Explanation: The Hijrah months follow a set order beginning with Muharram.
The sequence continues as Safar, Rabi' al-Awwal, Rabi' al-Thani, Jumada al-Ula, Jumada al-Akhirah, Rajab, Sha'ban, Ramadan, Shawwal, Dhul-Qi'dah, and Dhul-Hijjah.
Ramadan is the month in which Muslims observe compulsory fasting from dawn to sunset.
In this order, Ramadan comes after Sha'ban, the eighth month, and before Shawwal, the tenth month.
Therefore, counting from Muharram, Ramadan holds the ninth position in the Hijrah calendar.
This makes option C the correct answer.
Answer: C. ninth.