Probably as has already been said, this would be a metaphor, but see note at end.
Allusion refers to a famous person, place or event. For example, He was the Van Gogh of his kindergarten art class, refers to Van Gogh and compares the talents of the two individuals. This is a form of figurative language.
Suspense is language that creates a sense of fear or dread by offering a description. The following quote from Poe's "The Cask of Amontillado" provides suspense as the reader moves along through the story:
“The nitre!” I said; “see, it increases. It hangs like moss upon the vaults. We are below the river's bed. The drops of moisture trickle among the bones.
A metaphor compares two dissimilar things as if they were the same. The two things described simply share similar characteristics. You are the sunshine of my life is a metaphor. The woman (or man) being described will not give you sunburn or melt the blacktop driveway in the summer, but he/she is probably warm, with a "sunny" disposition. In terms of "metaphor," some might consider this a metaphor, comparing the cat and the mouse to children playing.
Personally, I think I would be more apt to identify the example as personification. It gives human characteristics to non-human things. Cats and mice certainly do NOT "play." However, in that this choice is not given, I would go with "metaphor." (Had both choices been given, the answer would have been much harder, I would imagine.)