Which is the first extant poem of John Keats, which is written in the year 1814 when when was 19 years of age ?

Which is the first extant poem of John Keats, which is written in the year 1814 when when was 19 years of age ?

A. La Belle Dame Sans Mercy
B. Ode on a Grecian Urn
C. Ode to a Skylark
D. An Imitation of Spenser