According to Yen (2013), community

psychologists -----.

I. 

contributed to policy development in a range of

sectors

II.  

contributed towards the development of curricula

and texts for training contextually sensitive psychologists

III. 

contributed to the development of Afro-Euro

psychology

IV. engaged in research addressing priority issues

that threatened democracy

IV. 

played a key role in bringing community psychology

to Africa

The correct answer is: