What is the longest possible wavelength for a line in the balmer series

" In the Balmer series, the transitions happening in visible range are considered, which range from around 400 nm to 700 nm. The longest wavelength visible in the Balmer series is 656 nm."

Explanation:

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i believe the answer would be:

d. violin, clarinet, french horn, and tuba

the answer is b, have negligible mass