Question

the first model of the atom was developed through
scientific experimentation and data analysis with water vapor and gases.
observation of the light emitted by elements when they are heated.
thinking about the smallest particles of matter without experimenting.
analyzing the effects of a magnet on the path of a cathode ray.

Explanation:

The first atomic model (Dalton's) was developed through philosophical and theoretical reasoning about the smallest matter particles, without experimental evidence initially. The other options relate to later experiments (like gas laws, spectral analysis, cathode ray for electron discovery) not the first model.

Answer:

C. thinking about the smallest particles of matter without experimenting.