The ancestor of the modern oboe is the shawm, a double-reed instrument used in the Renaissance. It has a loud sound similar to the oboe used in orchestras today. The other options, such as the sackbut, cornetto, and slide trumpet, refer to different types of instruments. ;
The ancestor of the modern oboe is the shawm, a double-reed woodwind instrument popular during the Renaissance. The shawm produces a loud sound similar to the modern oboe and was a common choice for outdoor music. Thus, the correct answer is A. shawm.
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