Concept:Reciting Sūrah al-Fātiḥah is a compulsory pillar of every unit (rakʿah) in the obligatory prayers.
Explanation:Al-Fātiḥah, meaning "The Opening," is the first chapter of the Glorious Qur'an and has seven verses.
It is a prayer for the guidance, lordship, and mercy of Allah.
The Prophet (peace be upon him) declared that there is no valid prayer for the one who does not recite the Opening of the Book.
Therefore, al-Fātiḥah must be recited in every obligatory prayer and in each rakʿah.
The other surahs mentioned cannot replace it.
Sūrah al-Baqarah is lengthy and optional, while al-Alaq and al-Ikhlās may be recited only after al-Fātiḥah as additional verses.
Answer:C. al-Fātīhah