What kind of complement is the underlined word?

my parents' wedding anniversary is the first day of april.

a.
predicate adjective

b.
direct object

c.
predicate nominative

d.
indirect object

day is underlined

Read the poem. "there is no frigate like a book" (1263) by emily dickinson there is no frigate like a book to take us lands away, nor any coursers like a page of prancing poetry-- this traverse may the poorest take without oppress of toll-- how frugal is the chariot that bears the human soul. what is the primary metaphor in this poem? question 1 options: the reading experience is compared to taking a journey. a ship is compared to a book. a horse is compared to a page. a chariot is compared to a soul.