请教一道0010的语法题

diatomss

18. In the early 1900's, Roy Harris created and promoted a distinctly American style of classical musci and greatly influenced a number of composer in the United States

这道题很明显composer有问题，可是我觉得distinctly这个副词用在这里也有问题，请大侠出手

falcons

'american' can be either an adjective or a noun.

thus, distinctly is correct. a distinctly/adv + American/adj. + style/n