Look at this image of a star cluster.
which type of star cluster is shown?
open
binary
globular
eclipsing

The correct answer is globular.

Explanation:

A huge group of old stars, which are packed closely in a symmetrical, somewhat in a spherical formation is known as a globular cluster. They are known as globular due to their roughly spherical look and are the most massive and the largest kinds of star clusters. The Milky Way galaxy comprises of approximately 150 globular clusters.

Option A

Explanation:

Open star clusters are irregularly shaped star clusters which is not bounded by gravity or very loosely bound by gravity.  

Only group of spiral and irregular galaxies form the open star cluster.  

The young open clusters are confined within the molecular cloud and all the starts are of exactly the same age and composition. Any changes or variations can be easily studied in these star clusters.  

Hence, option A