A: Intermediate. If you can play Chopin’s Prelude in E minor (op. 28 no. 4), you can play this. The difficulty is in the rubato and ensemble coordination, not the notes.
To understand the weight of Jenkins’ composition, one must first appreciate the text he set. The Ave Verum Corpus is a Eucharistic hymn dating back to the 14th century, traditionally attributed to Pope Innocent VI. For centuries, it has served as a staple of liturgical music, most famously set by Wolfgang Amadeus Mozart.
: The piece is primarily scored for SATB chorus (Soprano, Alto, Tenor, Bass) and can be performed a cappella or with piano/organ accompaniment.