Select the best version of this sentence. a. neither a convertible nor a hatchback is appropriate for me. b. neither a convertible nor a hatchback are right for me. c. neither a convertible nor a hatchback are appropriate for me. d. neither a convertible nor a hatchback were right for me.

   A." Neither a convertible nor a hatchback is appropriate for me " is the best version because when using the correlative conjunction Neither-Nor the verb must agree with the noun closer to it (The hatchback is not appropriate). The other versions do not agree with the noun.

  One thing else to analyze is the use of the expressions "right for me" and "appropriate for me"; to choose for one of these similar expressions when writing a text, the public and level of formality must be considered as the word "appropriate" is the most formal one.

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in june, we will have been married for eighteen months. (i am assuming this is what you want? the sentence, as you have presented it, is grammatically incorrect--   you want it corrected, yes? )