Based off the context of this sentence, the strong points: "one taste 'provoked another'", "to the flagon 'so often'", "that 'at length'", the synonym and or simpler definition to the said word (reiterated) or reiterate, would be repeat.
Actual definition of < reiterate >
Re•it•er•ate \rē-'it-e-'rāt\ vt-at•ed; -at•ing [L reiteratus, pp. of reiterare to repeat, fr. Re- + iterare to iterate] (1526) : to state or to do over again or repeatedly sometimes with wearying effect - re•it•er•a•tion \(') rē-,it-e-'rā-shen\ n - re•it•er•a•tive \ rē-'it-e-,rāt-iv, -ret-iv; -'i-tret-iv\ adj - re•it•er•a•tive•ly adv
Source for definition:
Webster's Ninth New Collegiate Dictionary
By: A. Merriam-Webster
The theme of Henrik Ibsen's A Doll's House that is reflected in this excerpt from act 1 of the play is ambition. Nora in here is so happy that she can get what she wants with Torvald. Torvald has so much power over people. Also, even though macaroons is bad for her, she eats them anyway and gives some to Doctor Rank and Christine.
Answer:
c) Semicolon
Explanation:
When the content of two or more independent clauses are closely related, we can join them with a semicolon or coordinating conjunction like “or,” “and,” “but,” “yet” or “so.” If we used a comma instead, a comma splice would occur, which is one of the mistakes made when using a comma incorrectly.
Likewise, a “run-on” is not a possible answer either because it refers to a sentence-error that occurs when two independent clauses are not joined correctly.