Why did many northern european artists turn to painting portraits and landscapes?

 The correct answer is :  Because the religious art market was decreasing markedly

Explanation:  The renaissance in northern Europe introduced new genres, such as landscapes, rural life, animals, portraits, works about everyday life. While the religious works were altarpieces formed by several folding panels. In England and the north of the Netherlands, the Reformation practically ended with the tradition of religious painting.

i think a and b is the answer