Concept:Surah at-Tin opens with four divine oaths sworn by Allah to affirm the truth of its message.
Explanation:Surah at-Tin (The Fig) begins with four separate oaths.
The first oath is taken on the fig: "By the fig."
The second oath is taken on the olive: "and the olive."
The third oath is taken on the sacred mountain: "and [by] Mount Sinai."
The fourth oath is taken on the holy city: "and [by] this secure city [Makkah]."
The fig and the olive are counted as two distinct oaths, giving a total of four.
None of the other listed surahs matches this pattern.
Surah ad-Duha opens with only two oaths.
Surah al-Kafirun and Surah Alaq do not open with any oath at all.
Therefore, the surah that begins with four oaths is at-Tin.
Answer:The correct option is C. at-Tin.