Answer:
In Buddhism, the experience that Petra is referring to is called "enlightenment" (option A).
Step-by-step explanation:
Enlightenment is the ultimate spiritual goal of Buddhist practice and refers to the realization of the true nature of oneself and all phenomena. It involves overcoming ignorance and delusion and achieving a state of perfect wisdom, compassion, and inner peace. The path to enlightenment involves meditation, ethical conduct, and the development of wisdom through study and reflection. The term "sangha" (option B) refers to the Buddhist community of monks and nuns, while "karma" (option C) refers to the law of cause and effect that governs the cycle of birth and death. A "stupa" (option D) is a Buddhist architectural structure that contains relics or other sacred objects and is used as a place of meditation and veneration.