The Rutherford `alpha`- particle experiment shows that most of the `alpha`- particles pass through almost unscattered while some are scattered through large angles. What information does it give about the structure of the atom:

Options

A. Atom is hollow
B. The whole mas of the atom is concentration in a small centre called nucleus
C. Nucleus is positively charged
D. All the above

Explanation

### Step-by-Step Solution:

1. **Introduction to the Experiment**:
- Rutherford conducted an experiment using alpha particles directed at a thin gold foil. The purpose was to investigate the structure of the atom.

2. **Observation of Alpha Particles**:
- Most of the alpha particles passed through the gold foil without any deflection (undeviated).
- A smaller fraction of the alpha particles were deflected at small angles.
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