Bihar is a major center for the production of:

Silk and cotton textiles
Terracotta pottery
Lac bangles
All of the above

Bihar is a major center for the production of all of the above: silk and cotton textiles, terracotta pottery, and lac bangles.

Silk and cotton textiles are a major industry in Bihar. The state is home to a number of textile mills that produce a variety of fabrics, including silk, cotton, and jute. The textile industry employs a large number of people in Bihar and contributes significantly to the state’s economy.

Terracotta pottery is another important industry in Bihar. The state is home to a number of villages that specialize in the production of terracotta pottery. The pottery is made from a mixture of clay and sand and is fired in kilns. It is used for a variety of purposes, including cooking, storage, and decoration.

Lac bangles are a traditional handicraft of Bihar. They are made from the resin of the lac tree and are decorated with a variety of designs. The bangles are worn by women on special occasions and are considered to be a symbol of beauty and prosperity.

In conclusion, Bihar is a major center for the production of silk and cotton textiles, terracotta pottery, and lac bangles. These industries are important to the state’s economy and employ a large number of people.