Joans hair began to fall out two days after she dyed it. Choose the correct version of the sentence from the following options: 1. Joan's hair began to fall out two days after she dyed it. 2. Joans hair began to fall out two day's after she dyed it. 3. Joans hair began to fall out two days after she's dyed it. 4. Joans' hair began to fall out two days after she dyed it.

Answer
The correct answer is: "Joan's hair began to fall out two days after she dyed it." Explanation: 1. Possessive Case: The hair belongs to Joan. In English, to show possession for a singular noun (Joan), you must add an apostrophe followed by an 's'. Therefore, 'Joans' must be corrected to 'Joan's'. 2. Plural vs. Possessive: The word 'days' is a simple plural indicating the amount of time. It does not need an apostrophe (as seen in the incorrect 'day's') because nothing belongs to the days in this context. 3. Verb Tense: The sentence describes a past event. 'She dyed it' is the correct past tense. 'She's dyed it' is a contraction for 'she has dyed it', which does not fit the grammatical structure of this specific narrative sentence as well as the simple past tense does. 4. Incorrect Plural Possession: 'Joans'' would imply multiple people named Joan, which is incorrect here as Joan is a single person.