When i wake up in the morning, i can hear the " tweet tweet" of bird outside my window
a idiom
b onomatopoeia
c irony
d personification

a lot

explanation:

covert: hidden or secret

candid: truthful and straightforward

what i get from these phrases is covert means undercover or underground and that's where the flower is in april. on the other hand, may is the month where flowers start to bloom and thats the reason why candid is being used as a word to describe the blossoming period of a flower.

hope this answer you.