Final answer:
The student who requires intervention focused on explicit phonics instruction is a kindergarten student who can recite the alphabet but has difficulty distinguishing individual phonemes in words.
Step-by-step explanation:
The student who demonstrates variation in reading development that would require intervention focused on explicit phonics instruction is the kindergarten student who can recite the alphabet from memory but has difficulty distinguishing individual phonemes in words. Phonemic awareness is the ability to recognize and manipulate individual sounds in spoken words, and it is a crucial skill for reading development. Although the student can recite the alphabet, struggling with distinguishing individual phonemes indicates a need for explicit phonics instruction.