Final answer:
The provided texts do not include a promise made by a character named Tzeitel. Thus, none of the answer choices match the promises to the contents of the excerpts.
Step-by-step explanation:
From the provided text excerpts, Tzeitel does not make a direct promise in any of the listed quotes. Each passage from different contexts shows characters expressing love, fear, and contemplation about love and future uncertainty, but none feature a character named Tzeitel making a specific promise. Therefore, based on the given text, none of the provided answer options (a. That everything will be perfect, b. That there's more to life than happiness, c. That she will find a good match, d. That she will keep a secret) directly pertain to a promise made by Tzeitel.
It's possible that Tzeitel is a character from an unstated text, such as from Fiddler on the Roof, where she is a character that experiences the issues of marital engagement. But without a direct quote from that character, it can't be determined what promise Tzeitel might have made.