Final answer:
Choirs often wear c. red jackets to stand out during their performances, as the vibrant color draws attention and contrasts with other colors.
Step-by-step explanation:
The clothing that causes the choir to stand out from the others can vary depending on the choir's choice of uniform. To answer the question specifically, the choice of clothing listed in the options that typically makes a choir stand out is c) Red jackets.
Choirs often choose distinct clothing such as red jackets to have a uniform appearance and be easily identifiable during performances. The color red is vibrant and can contrast well against other colors, thereby drawing attention to the group and highlighting their presence.
Whether for school choirs, church choirs, or professional ensembles, colorful or unique clothing choices are an important aspect of performance presentation.