Concept: Rhyming words are determined by sound, so two words rhyme when their final vowel and consonant sounds are identical, even if the spellings differ.
Explanation:The given word "seer" is pronounced /sɪə/ in standard British English.
This ending sound is important for selecting a rhyming word.
Now examine the ending sounds of the options.
Option A, "snare", is pronounced /sneə/.
Option B, "spare", is pronounced /speə/.
Option D, "square", is pronounced /skweə/.
These three options all end with the vowel sound /eə/ (like the "air" sound), which is different from the sound in "seer".
Option C, "spear", is pronounced /spɪə/.
It shares the same final sound /ɪə/ as "seer".
Therefore, when spoken aloud, "seer" and "spear" rhyme.
Answer: C. spear