Which word could correctly replace the word melancholy as it is used in this excerpt from mark twain’s the prince and the pauper?

there was a cold drizzle of rain; the atmosphere was murky; it was a melancholy day. at night tom reached home so wet and tired and hungry that it was not possible for his father and grandmother to observe his forlorn condition and not be moved—after their fashion; wherefore they gave him a brisk cuffing at once and sent him to bed.

a. pensive
b. gloomy
c. humid
d. dark