Answer:
A) an allusion
Step-by-step explanation:
Allusion happens when you make a reference or quote to something or someone. In the case of the phrase shown in the above question, the author conveys joy through the allusion (ie reference) to the song "Heatwave". Allusion is a kind of intertext, where one text relates to another explicitly or implicitly. Thus it is permissible to mention facts, people, works of art, historical events, music, celebrities, already existing in other works.