Is the underlined group of words an adjective phrase or an adjective clause? "at school he saw many people studying for tests." adjective phrase adjective clause

How was scriptotherapy used? oa. protestors wrote narratives about vietnam that ran counter toveterans' own stories. ob. writers who lived in the 1960s and 1970s wrote unusual stories todefy traditionoc. soldiers filmed footage of the war in vietnam to tell their storyod. vietnam veterans began to write to work through their trauma