Which astronomical structure can be observed from Earth and is located near Eta Carinae?

The Carina Nebula is indeed the correct choice because it is a vast and bright region of star formation that is located in the Carina constellation, near the massive star Eta Carinae. This nebula is one of the largest and most prominent star-forming regions in our galaxy and is easily observable from Earth with the right equipment, such as a telescope. The Carina Nebula contains a variety of interesting astronomical features, including stellar nurseries and the massive stars that have formed from the gravitational collapse of gas and dust within this nebula.

Observing the Carina Nebula provides insight into the processes of star formation and the lifecycle of stars, making it a significant subject of study in astronomy. Additionally, Eta Carinae itself is one of the most massive stars in the galaxy, located within this nebula, and serves as a reference point for observing the complex structures surrounding it.

The other structures listed in the options, while notable in their own right, are located in different areas of the sky and are not situated near Eta Carinae, making them less relevant to the question.