Parallelism is a common principle of design, implying

Even though this composition uses plainchant as a point of departure, the composer?

a) remained faithful to the original plainchant voice b) replaced that plainchant with an entirely newly composed part c) used its in augmented note values in the uppermost part d) manipulated it in various ways

What is the correct terminology for this cadence in the key of A minor?

A. deceptive cadence B. plagal cadence C. dominant cadence D. authentic cadence E. half cadence