Which of the following does NOT make the "k" sound when pronouncing it?

O a. Cornea
O b. Quadruplet
O c. Cephalic
O d. Cavity

The correct answer is d. Cavity.

To determine which of the options does NOT make the "k" sound, we need to focus on the pronunciation of the letter "k" in each word.

a. Cornea: This word contains the letter "k" at the end, and it is pronounced as "k." Therefore, it makes the "k" sound.

b. Quadruplet: The letter "k" appears in the middle of this word. It is pronounced as "kw" in this case, making the "k" sound. So, it also makes the "k" sound.

c. Cephalic: Although the letter "c" appears in this word, it is not always pronounced as "k." In this case, "ce" is pronounced as "se." So, the word "cephalic" does not make the "k" sound.

d. Cavity: This word contains the letter "c" at the beginning, which usually makes the "k" sound. Therefore, it does make the "k" sound.

Based on the analysis, the word that does NOT make the "k" sound when pronouncing it is option c. Cephalic.

The letter "k" makes the "k" sound in words like "cornea," "quadruplet," and "cavity." However, it does not make the "k" sound in the word "cephalic." So the correct answer is c. Cephalic.