millennium : millennia ::
  1. alumna : alumnae
  2. son-in-law : son-in-laws
  3. antenna : antennas
  4. dice : die
Explanation
Answer: Choice (A) is correct.

Millennia is the plural form of millennium, so look for a pair in which the second term is the plural form of the first. Choice B is incorrect, because the plural form should be sons-in-law. Choice C is incorrect, because the plural form should be antennae. Choice D is incorrect because the plural form - dice - is the first word in the pair. Alumnae is the plural form of alumna, so (A) is the best choice.
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