What purpose did the monroe doctrine serve
a: to wage war against european nations
b: to make peace with other american nations
c: to start american colonies in the western hemisphere
d: to stop europeans nations from colonizing more land in the americas
i need this answer as fast as i can get it

D: to stop Europeans nations from colonizing more land in the Americas

experiments.

surveys.

questionnaires.

interviews.

case studies.

participant and non-participant observation.

observational trials.

studies using the delphi method.

by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.