Horner's syndrome consists of -
Horner's syndrome is characterized by classical triad of ipsilateral ptosis, miosis and anhydrosis.
Option 'a' is also correct as enophthalmos also occurs. However, it is not included in the classical triad of Homer's syndrome. So, best answer here is option 'd'.
Miosis and enophthalmos
Miosis and exophthalmos
Miosis and proptosis
Miosis and ptosis