When campaign workers are canvassing neighborhoods, one of their goals is to identify voters who will support their candidate.
sell campaign buttons door to door.
determine the income level of a community.
find out which candidate voters have selected

of those who start drinking before they're 15 will develop alcohol dependence

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.

blue

light-years

magnitude

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.