The answer is 'colluded', because it means that they schemed to do it secretly. The other options aren't possible here, and most of them are adjectives, and you need a verb.
For what though. Is there something there I need to see to answer the question?
Picnic. frivolity is something that is unnesasary/enjoyable.
People don't have feathers so D is not an option. Alliteration is the repetition of the same beginning sound in a group of words so that also is not an option. Simile uses like or as - not an option. Metaphor is a comparison of two different things, hope to a bird (thing with feathers). B is correct.
