To resolve this, it helps to look at where each numbered section actually sits within the structure of the Bharatiya Nyaya Sanhita, 2023 and what offence each one is built to punish.
Since only Section 113 supplies the actual definition and punishment structure for a terrorist act within the general code, that is the provision being asked for.
The correct answer is Section 113.
Before naming the section, it helps to recall why this question matters: earlier, "terrorist act" as a defined offence existed only in special legislation, most notably the Unlawful Activities (Prevention) Act, 1967, and was absent from the general penal code applied in ordinary criminal trials. The task is to find exactly where the Bharatiya Nyaya Sanhita changed this.
Since the codification of a stand-alone, general-code definition of "terrorist act," with its own intents, means and punishment scale, happened in one specific section, that is the answer being sought.
The correct answer is Section 113.