Question

What accounts for the absorption spectra of elements?

electrons moving in opposite directions around the nucleus
electrons spinning around the nucleus within orbits
electrons moving from low energy levels to high energy levels
electrons moving from high energy levels to low energy levels

Answer 1

D?

Answer 2

Yes D is right. This essentially covers what "absorption" means. Absorption occurs when electrons get excited from a source (any wavelength), which leads to electronic transitions from higher energy levels to lower energy levels.