The cool way is to use the method that @alinder used above and get the list of String Equivalents off the MS website for the WMI call:
q: tuple string items (integer values of selects ("EncryptionMethod from win32_EncryptableVolume WHERE DriveLetter='" & (name of drive of system folder) &"'") of WMIs "root\CIMv2\Security\MicrosoftVolumeEncryption") of "None, AES_128_WITH_DIFFUSER, AES_256_WITH_DIFFUSER, AES_128, AES_256, HARDWARE_ENCRYPTION, XTS_AES_128,XTS_AES_256"
A: AES_256
0 turns into None, 1 into AES_128_WITH_DIFFUSER. My C drive is a 4, or AES_256