Concept:The question tests the initial consonant sound represented by the underlined letter.
Explanation:The underlined letter is the initial "h".
The word "house" is pronounced /haʊs/, so it begins with the /h/ sound.
In "heir", "honest", and "hour", the initial "h" is silent.
These words begin with vowel sounds, not the /h/ sound.
Hence, only "house" has the same consonant sound.
Answer:A. house