If you wanted to study regions where star formation is currently happening you could use:
A) H-alpha emission to look for O and B stars
B) 21 cm radiation to find neutral hydrogen clouds
C) radio emission from carbon monoxide (CO) to find molecular cloud cores
D) infrared emission to identify T Tauri stars
E) all of the above

Question

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The Answer of If you wanted to study regions where star formation is currently happening you could use:
A) H-alpha emission to look for O and B stars
B) 21 cm radiation to find neutral hydrogen clouds
C) radio emission from carbon monoxide (CO) to find molecular cloud cores
D) infrared emission to identify T Tauri stars
E) all of the above

If You Wanted to Study Regions Where Star Formation Is