請依下文回答第 26 題至第 30 題：
         Many studies have shown that musical training can enhance language skills. However, it was unknown whethermusic lessons improve general cognitive ability, leading to better language proficiency, or if the effect of music is morespecific to language processing. A new study has found that piano lessons have a very specific effect on kindergartners’ability to distinguish different pitches, which translates into an improvement in discriminating between spoken words.However, the piano lessons did not appear to confer any benefit for overall cognitive ability, as measured by IQ, attentionspan, and working memory.
          Previous studies have shown that on average, musicians perform better than nonmusicians on tasks such as readingcomprehension, distinguishing speech from background noise, and rapid auditory processing. However, most of thesestudies have been done by asking people about their past musical training. The MIT researchers wanted to perform amore controlled study in which they could randomly assign children to receive music lessons or not, and then measurethe effects. After six months, the researchers tested the children on their ability to discriminate words based ondifferences in vowels, consonants, or tone (many Mandarin words differ only in tone). Better word discrimination usuallycorresponds with better phonological awareness — the awareness of the sound structure of words, which is a keycomponent of learning to read. Children who had piano lessons showed a significant advantage over children in the extrareading group in discriminating between words that differ by one consonant. Children in both the piano group and extrareading group performed better than children who received neither intervention when it came to discriminating wordsbased on vowel differences.
26 According to this passage, on which of the following tests were musicians found to perform better?
(A) IQ tests.
(B) Working memory tests.
(C) Reading comprehension tests.
(D) Word discrimination tests.