Songs sung during agricultural activities like sowing, harvesting, and threshing are known as:

Festive songs
Devotional songs
Work songs
Lullabies

The correct answer is c) Work songs.

Work songs are songs that are sung to accompany or lighten the burden of physical labor. They are often used in agricultural settings, such as during sowing, harvesting, and threshing. Work songs can be simple or complex, and they may be sung in unison or in harmony. They often have a repetitive rhythm that helps to keep the workers in time. Work songs can also be used to pass the time, to express emotions, or to communicate instructions.

Festive songs are songs that are sung on special occasions, such as holidays or weddings. They are often joyful and upbeat, and they may be accompanied by dancing or other festivities.

Devotional songs are songs that are sung to express religious devotion. They may be sung in a church or other place of worship, or they may be sung privately. Devotional songs often have a solemn or meditative tone.

Lullabies are songs that are sung to babies to help them fall asleep. They are often gentle and soothing, and they may have a repetitive rhythm.