Although adults have difficulty discriminating among many language sounds that are not present in the languages that they speak, can discriminate among the sounds of all languages.

10-month-old infants

Explanation:

According to the research ,10-months to 12 months infant have better tendency to perceive different between language than adults .They can approach the rhythmical difference in the languages such as English, Japanese, French etc.

According to the question, 10 month old babies have the tendency to differentiate between different sounds of many languages because of high level of detection of tones and sound .They respond in different manner towards language.  

answer; /// i do believe that the correct answer is (d) majority vote as an approval requirement;

of what agreement it does not show