Protostar is a developing star not yet hot enough to engage in the process of:

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Nuclear fusion

Nuclear fission

Atomic transmission

Atomic emission

answer is A.

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Detailed Solution

Concept: The protostar is the development stage of a star. Only at extremely high temperatures does nuclear fusion occur. The protostar will continue to collapse due to gravity until it becomes hot enough for nuclear fusion to occur in order to offset gravitational force.
A protostar is a star in its early stages of formation. When a cloud of gases compresses due to gravity, a star is born. It will continue to collapse until hydrogen fusion occurs at a high enough temperature to cease the collapse. We know that the fusion process occurs only at extremely high temperatures. Two tiny nuclei merge to produce a big nucleus during the fusion reaction. To generate the requisite energy for the nucleus to combine, a high temperature is required. This is because there will be Coulomb repulsion between the nuclei when they unite. Because similar charges repel one another.
The protostar is a star's early stages of development. Only at high temperatures can nuclear fusion occur. As soon as the protostar becomes hot enough for nuclear fusion to occur, it will stop collapsing under the effects of gravity.
Hence, option 1 is the correct answer.

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