Final answer:
The central theme of 'Shepherd' is Nature and Beauty (b), focusing on the seductive qualities of pastoral life, while 'The Lady of Shallot' mainly deals with the Curse of Isolation (c).
Step-by-step explanation:
The central theme of Shepherd, also known as 'The Passionate Shepherd to His Love' by Christopher Marlowe, revolves primarily around the romantic ideation of pastoral life and the seduction of love within it, which might suggest the options of both love and loss (a) and nature and beauty (b). However, this poem largely emphasizes the idyllic and utopian vision of pastoral living, so the most appropriate answer would be b) Nature and Beauty.
On the other hand, the primary theme in 'The Lady of Shallot' by Alfred Lord Tennyson is the Curse of Isolation (c). In this narrative poem, the titular character is bound to a solitary life, weaving a tapestry and only able to witness the outside world through a mirror. The poem explores themes related to the consequences of isolation and the yearning for a life unattainable, which ultimately leads to her tragic fate.