Final answer:
The subject of the verb in the sentence is 'Quilts,' and the correct verb form that agrees with this plural subject is 'include.' Amish quilts are recognized for their solid colors and bold, geometric patterns.
Step-by-step explanation:
The subject of the verb in the sentence 'Quilts designed by the Amish include only solid colored fabrics and not printed ones.' is 'Quilts.' We need to choose the verb form that agrees in number with this plural subject, which in this case is include, meaning the sentence should read 'Quilts designed by the Amish include only solid colored fabrics and not printed ones.'
The Amish quilts are known for their bold designs and solid colored fabrics, which have become a significant part of their culture and history. These quilts are often made from wool in Pennsylvania and cotton in Ohio and have evolved from practical bedding to a form of artistic expression that is showcased in museums worldwide.