Which of the following has contributed most to our understanding of the

process of star formation? <table><tbody><tr><td>a.</td> <td> Astronomers have observed star formation as it happens for a large number of stars. </td> </tr><tr><td>b.</td> <td> Theoretical models predict the way stars form. </td> </tr><tr><td>c.</td> <td> Astronomers have observed star formation as it happens for a small number of stars. </td> </tr><tr><td>d.</td> <td>Astronomers have observed many different stars at each step of the formation process.</td> </tr></tbody></table></li> </ol><br /><br />

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