The author conveys the joy in this excerpt "A group in the back started fanning themselves and singing the song 'Heatwave,' making everyone laugh and sing along" through the use of

A) an allusion

b) anaphora

c) a metaphor

d) repetition

I believe the correct answer from the choices listed above is option A. The author conveys the joy in this excerpt through the use of allusion. Allusion is a brief and indirect reference to a person, place, thing or idea of historical, cultural, literary or political significance. Heatwave is the allusion used. Hope this answers the question.