Abt Vogler is authored by

The correct option is Robert browning.

Explanation:
"Abt Vogler" is a famous poem written by the prominent Victorian poet Robert Browning, first published in his 1864 collection titled Dramatis Personae.
The poem is written in the form of a dramatic monologue, a poetic form that Browning is highly celebrated for mastering. In the poem, the speaker is Georg Joseph Vogler (an actual historical German organist and composer known as Abt Vogler), who extemporizes music on an instrument he invented and reflects on the transient nature of music, art, and the spiritual connection between humanity and the divine.