You observe a spiral galaxy with a large central bulge and tightly wrapped arms. It would be classified a

Sa

Explanation:

Spiral Galaxies -

It is a disk shaped galaxies which have spiral structure, is refereed to as spiral galaxies.

According to Hubble, these galaxies are classified as Sa, Sb, Sc.

Where,

Sa - have the structure, which is bulged from the central portion, along with a tightly wrapped spiral structure.

Sb - have a lesser bulge and the spiral is looser.

Sc - It has very weak bulge with the open spiral structure.

Hence, from the question,

The given information is about the Sa.