Tier 1 words are best described as:

• A. The words of a language
• B. Common, basic words used in everyday conversations and that most children know
• C. Sophisticated words used across texts
• D. Letters and their pronunciations

Answer: (B)

Tier 1 words are high-frequency, everyday vocabulary that children typically already know from daily life and conversation. Because these words appear across many contexts, they usually don’t require explicit instruction and form the foundation for understanding spoken and written language. They aren’t specialized academic terms (that would be Tier 2) or domain-specific vocabulary (Tier 3). They’re simply the common, basic words most children know from everyday use, which is why that description fits best.