The ____ space contains the heart, aorta, esophagus, and bronchi.

A. abdominal
B. pelvic
C. thoracic
D. cranial

C. thoracic

The correct answer is C. thoracic.

The blank space in the question refers to a specific anatomical space that contains the heart, aorta, esophagus, and bronchi. To find the correct answer, we need some basic knowledge of human anatomy.

The abdominal space (option A) refers to the region below the diaphragm, which contains organs such as the stomach, liver, intestines, and kidneys. This is not the correct option.

The pelvic space (option B) is located at the lower part of the abdomen, and it contains organs such as the bladder, reproductive organs, and rectum. This is also not the correct option.

The cranial space (option D), also known as the cranial cavity, is located within the skull and contains the brain. This is not the correct option either.

The correct answer is the thoracic space (option C). The thoracic cavity is located between the neck and the diaphragm and includes the organs mentioned in the question. The heart, aorta, esophagus, and bronchi are all found within the thoracic cavity.

Therefore, the correct answer is C. thoracic.