Which of the following are true of the plays performed in the eighteenth century in the United States?Multiple select question.Performances usually included a main drama and also a shorter, lighter, often comic piece.Music was absent from most plays. Sometimes a march played at the end led the audience out of the hall to attend a nearby dance.Performances usually lasted less than an hour.

Without specific context or sources, it's hard to definitively answer this question. However, based on general knowledge of 18th-century theater:

1. Performances usually included a main drama and also a shorter, lighter, often comic piece: This is likely true. It was common for performances to include a main drama and a shorter, lighter piece, often a farce or afterpiece, to provide comic relief.

2. Music was absent from most plays: This is likely false. Music was an integral part of theater in the 18th century, often used to set the mood or enhance the storytelling.

3. Sometimes a march played at the end led the audience out of the hall to attend a nearby dance: This could be true. It was not uncommon for music to be used to signal the end of a performance, and social events like dances often followed theatrical performances.

4. Performances usually lasted less than an hour: This is likely false. Given the structure of performances (a main drama followed by a shorter piece), it's unlikely that they would have been less than an hour long.

Without the specific options to select from, it's hard to give a definitive answer. However, based on the statements given:

1. "Performances usually included a main drama and also a shorter, lighter, often comic piece." - This is generally true. In the 18th century, it was common for performances to include a main drama and a shorter, often comedic piece to provide variety and entertainment.

2. "Music was absent from most plays." - This is generally false. Music was a significant part of 18th-century theatre, often used to set the mood or enhance the storytelling.

3. "Sometimes a march played at the end led the audience out of the hall to attend a nearby dance." - This could be true. It would depend on the specific traditions of the theatre or the event, but it's plausible that music could be used in this way.

4. "Performances usually lasted less than an hour." - This is generally false. Most theatrical performances, especially those that included multiple pieces, would have lasted longer than an hour.