Discussion
The unaccreted gas and dust during the early planetary phase was blown away during :
Answer: A
The unaccreted gas and dust were blown away during the T-Tauri phase.
T Tauri stars are young, pre-main-sequence stars with strong stellar winds and intense radiation. When the young Sun passed through this phase, its wind is thought to have swept the remaining gas and fine dust out of the inner solar system, ending the growth of the terrestrial planets and leaving them poor in volatiles.
The nebular phase is the earlier stage when that gas and dust were present. 'Corona phase' and 'S-Tauri phase' are not stages of stellar or planetary evolution.
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