Concept:The letters "ck" in "black" together produce the single consonant sound /k/.We need the option that also contains the /k/ sound.Explanation:Check each option for the /k/ sound.Option A: "kneed" is pronounced /niːd/. Here the initial "k" is silent, so there is no /k/ sound.Option B: "know" is pronounced /noʊ/. Again, the initial "k" is silent, so no /k/ sound appears.Option C: "scene" is pronounced /siːn/. The letter "c" is silent in this word, so no /k/ sound is heard.Option D: "echo" is pronounced /ˈekoʊ/. In this word, the letters "ch" together represent the /k/ sound.Thus, "echo" shares the same consonant sound /k/ as the underlined "ck" in "black".Answer:D. echo