B). Violations are more likely to be short term than invasions.
Explanation:
Violation exemplifies the act of being violated(ignored) or transgression of a law, promise or rule which is short-termed and usually unintentional while on the contrary invasion is a deliberate and intentional attempt to intrude into an area where they are not wanted usually by military men in order to conquer a certain geopolitical entity. Thus, <em>in comparison invasions are more active, intentional, and long-lasting than the violations which are comparatively less active, unintentional and short-termed. </em>Thus, this makes us conclude option B as the answer to the given question.
A prepositional phrase describes the noun in this sentence the prepositional phrase is "of support" it is describing "letter" so the object of the preposition is "letter"
