Which of the following statements is true?
a. a promoter determines whether a gene is expressed.
b. an expressed gene is turned off.
c. proteins that bind to regulatory sites of dna determine whether a gene is expressed.
d. rna polymerase regulates gene expression.

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.

we would need to see the picture to answer it