which detail from the passage suggests that the glass armonica is a complex instrument?\na glass armonicas…

which detail from the passage suggests that the glass armonica is a complex instrument?\na glass armonicas were mass - produced during franklins lifetime.\nb franklin discovered that small bowls produce higher notes than large bowls.\nc franklin had to hire a glassmaker to design dozens of differently - shaped bowls.\nd a glassblower was required to tune the instrument on a regular basis.

which detail from the passage suggests that the glass armonica is a complex instrument?\na glass armonicas were mass - produced during franklins lifetime.\nb franklin discovered that small bowls produce higher notes than large bowls.\nc franklin had to hire a glassmaker to design dozens of differently - shaped bowls.\nd a glassblower was required to tune the instrument on a regular basis.

Answer

Brief Explanations:

The need for a glassblower to regularly tune the instrument implies complexity as it shows a high - level of skill and maintenance requirement. Mass - production (A) doesn't suggest complexity. Discovering note differences (B) is more about a scientific finding. Hiring a glassmaker for bowl design (C) is about construction but not as indicative of ongoing complexity as regular tuning.

Answer:

D. A glassblower was required to tune the instrument on a regular basis.