Final answer:
The level of brand recognition can be assessed by measuring consumer familiarity, understanding, and opinions about a brand. The correct option for marketers to use in this context is 'Recognition'.
Step-by-step explanation:
Marketers can assess the level of brand recognition by measuring the extent to which consumers in a market are familiar with a brand, know what it stands for, and have an opinion about it. The correct answer is b. Recognition. This involves understanding how readily consumers can identify the brand among other competitive offerings. Recognition is crucial for building a brand's presence in the market and is a key step towards developing customer loyalty and affinity.