Which term denotes a layer or level within a system?

• A. Callous
• B. Strata
• C. Contempt
• D. Lexicon

Answer: (B)

When you talk about a layer or level within a system, the word that fits is strata. Strata refers to stacked or hierarchical layers, whether in geology (rock layers), society (social strata), or other organized structures, making it the natural term for describing distinct levels.

The other options don’t fit because callous describes emotional insensitivity, contempt means a feeling of disdain, and lexicon means a vocabulary or dictionary of words. None of those indicate a layer or level within a system.

So, strata is the correct term, with the singular form being stratum.