Which of the following nouns is written in the correct plural form?

The noun "data" is considered the correct plural form in this context because it is the plural of "datum," which refers to a single piece of information. In scientific and academic settings, "data" is often treated as a plural noun.

The other choices do not use the appropriate rules for pluralization. For instance, "crisises" is an incorrect formation; the plural form of "crisis" is "crises." Similarly, "diagnosises" misses the correct pluralization; the proper plural of "diagnosis" is "diagnoses." Lastly, while "mosses" might appear correct at first glance, it is less commonly used compared to simply "moss," which often serves as the collective term. Thus, "data" stands out as the correctly formed noun in the plural.