Choose the correct spelling from the options given.

Concept: When a Latin/French-origin verb forms its related noun using a suffix such as "-tion", "-ition", "-ision" or "-sion", these suffix families are not interchangeable, and the noun does not always keep every vowel of its base verb unchanged. The safest way to judge a spelling option is to compare it, syllable by syllable, against the word's standard dictionary form rather than sounding it out.

Applying it here: the noun meaning "the act of doing or saying something again" is built as re- + pet- + "-ition" -- a single "e" in the middle syllable, no "a", and the ending "-ition" -- giving the standard dictionary spelling "repetition".

Comparing the options:

• "reparticion" inserts an extra "r" and the syllable "-arti-", then closes with the Spanish-style ending "-cion" (as in the unrelated Spanish word "repartición") -- a syllable and ending pattern that doesn't belong to this English noun.

• "repatision" swaps in the syllable "-pati-" and the ending "-ision", the suffix family used in words like "decision" and "division" -- not the "-ition" pattern this noun actually takes.

• "repeatition" keeps the "-eat-" spelling from the base verb "repeat" and doubles the vowel, adding an extra "a" and a repeated "e" that the noun form does not carry.

Result: comparing all four forms against the standard dictionary spelling, only "repetition" matches -- the other three each alter a syllable or suffix that doesn't belong to this word.