Answer:
Correct answer is Americans should avoid involvement in European alliances.
Step-by-step explanation:
Last option is the correct one because it reflects his opinion that United States should avoid any type on alliances, especially political with other countries.
First option is not correct as Washington is not mentioning army at all and is not referring to it.
Second option is not correct as Washington is not mentioning the spreading of American territory.
Third option is especially not correct because he he is actually saying that Americans should not join military alliances.