Vatican city is considered an enclave because it is
a. completely surrounded by rome, italy
b. geographically separated from the mainland of italy
c. a self-governing region within another state
d. occupied by the roman catholic church

The correct answer is C.

An enclave is defined as a territory with an independent government that is fully embodied within the territory of another self-governing state or nation.

This is exactly the case of Vatican City, where the headquarters of the Catholic Church are located. It is an independently governed state that is located inside the city of Rome, which is the capital of Italy.

i would say b probably

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.