The correct answer is option B, Simile
Simile is a figure of speech in which comparision is established between two different things. It is different than metaphor because unlike metaphor it does not draw resemblance by using words “like”, “as” etc. It is a direct comparision. Some example of Simile are as follows :
a) Radha is as fast as a tigress
b) Sia is as funny as a joker
Here in this question, Secret is compared with Sunday .