D
Below is a question with multiple-choice answers. Choose the correct option based on your reasoning.

### Question:
The North America Nebula is named for its similarity in shape to the North American continent. It was discovered within the Milky Way by astronomer William Herschel in 1790. What was Mr. Herschel most likely observing?

### Choices:
A. the explosion following the collapse of a star
B. a dense cluster of stars of varying magnitudes
C. meteorites as Earth passed through the tail of a comet
D. a cloud of hydrogen gas and dust where stars are born

### Answer:
