Final answer:
Medieval music is characterized as polyphonic, especially during the Ars nova period. Troubadour music was not polyphonic but monophonic and Adam de la Halle was a trouvere, poet, and musician. The Christian Church greatly influenced the Medieval Period.
Step-by-step explanation:
Medieval and Renaissance Music
1. Medieval music is best described as c. polyphonic. While it started with monophonic textures in the form of Gregorian chant, polyphonic music developed during the high medieval era, particularly with the Ars nova period.
2. The characteristic that is not a feature of troubadour music is d. polyphonic. Troubadour music, which spoke of courtly love and originated in France, was mainly monophonic.
3. Adam de la Halle is best described as a. he was a trouvere, poet & musician. His works contribute to the secular genre of the era.
4. The period when the Christian Church highly influenced culture and political affairs in Europe was a. Medieval Period. This era witnessed the intertwining of the church with various aspects of life including music, arts, and governance.