They are young; they don't concentrate well
It would be D, as inference implies that you are implying something from the text, as the question infers.
Answer:
A) It warned European countries not to make more colonies in the west.
According to Encyclopedia Britannica, two of the points made by the doctrine include that the Western Hemisphere was not an option for future colonization and that any attempt by a European power to take control of and/or oppress any country in the Western Hemisphere would be seen as an attack against the US.
Explanation:
