The earliest museums were established during the:A.Renaissance.B.19th century.C.18th century.D.20th century.

The earliest museums can be traced back to the Renaissance period, when they began to emerge as centers for the collection and display of art, artifacts, and knowledge. The idea of collecting objects of historical or cultural significance gained momentum during this time, leading to the establishment of the first public museums.

While there were earlier collections in private settings, such as the collection of curiosities (cabinets of curiosities) in the late Renaissance, the first true museum is often considered to be the Ashmolean Museum, founded in 1683 in Oxford, England.

Therefore, the correct answer is:

Final Answer

A. Renaissance.