Final answer:
The correct answer to which system prepares you to escape from a dangerous situation is the Flight System (B). Walter Cannon originally termed this the fight-or-flight response, which has since been expanded to also include fright and freeze reactions.
Step-by-step explanation:
The system which prepares you to escape from a dangerous situation is known as the fight-or-flight response.
This response is an involuntary human body reaction mediated by the nervous and endocrine systems that readies the body to fight or flee from perceived danger. Established by Walter Cannon in 1915, the concept initially included only fight or flight options, but has since been expanded to incorporate other reactions such as fright and freeze.
While Gray's system is not an established term in biology, the expanded understanding of the sympathetic system now recognizes that in addition to fighting or fleeing, an individual might freeze (become immobile) or experience fright (fear and paralysis) in the face of a threat. Although the question refers to "Gray's system", it is the Cannon's fight-or-flight system that is relevant to the subject matter.
Therefore, when taking into account the expanded understanding of the response, the correct answer to the question would be the Flight System (B). However, it should be noted that the terminology "Gray's system" is not typically used in scientific literature regarding this response.