A motif is dominant idea. A kigo is a word that is tied to a season. In this haiku, the kigo is April which is specifically tied to Spring. April is also the motif because the dominant idea of the haiku is April.
The right answer would be the third choice - forty five. We use hyphens for words in phrases like ex-boyfriend and non-alignment. In the case of numbers, all two-word numbers from twenty-one to ninety-nine must be hyphenated.
