In the following sentence, a word has been italicized. To what category of a noun does it belong? 

Always speak the truth. 

In contrast to concrete objects, abstract nouns represent a quality, a concept, or a state. The majority of abstract nouns are uncountable. Because the italicized term 'honesty' refers to the state of being honest, it is an abstract as well as an uncountable noun, and thus option A is valid. Option B is inaccurate because honesty cannot be counted; it is an abstract condition of being that cannot be measured. Option C is erroneous because concrete nouns refer to physical objects, and honesty is not one of them. Option D is erroneous because honesty is neither a tangible object nor a measurable quality.