The Hayashi track of a low-mass protostar in the H-R diagram is a path of approximately constant

Question

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The Hayashi track is a path on the H-R diagram that low-mass protostars follow as they contract and heat up towards the main sequence. During this phase, the protostar's interior is convective and the energy is transported primarily by convection, which means that the surface temperature remains approximately constant while the radius decreases and the luminosity decreases. Therefore, the best choice is C) temperature, as it is the only parameter that remains relatively constant during this phase.

The Hayashi Track of a Low-Mass Protostar in the H-R