https://networkmanager.dev/docs/admins/ - By default NetworkManager manages all devices found on the system. If you plan to configure an interface manually or through some other tool, you should tell NetworkManager to not manage it. - so it's not B
"By default, the NetworkManager daemon controls the network interfaces not mentioned in the /etc/network/interfaces file. It does so to not interfere with other configuration methods that may be present as well, thus modifying the unattended interfaces only."
https://learning.lpi.org/en/learning-materials/102-500/109/109.2/109.2_02/#:~:text=By%20default%2C%20the%20NetworkManager%20daemon%20controls%20the%20network%20interfaces%20not%20mentioned%20in%20the%20/etc/network/interfaces%20file.%20It%20does%20so%20to%20not%20interfere%20with%20other%20configuration%20methods%20that%20may%20be%20present%20as%20well%2C%20thus%20modifying%20the%20unattended%20interfaces%20only.
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