Pieter Bruegel the Elder was a Netherlandish representative
of the Reinaissanse period. As a painter, he is mostly known for his work
involving peasant scenes, being specialized in genre paintings, often with an
included landscape element. His main focus of the life and work of the peasants
was a rare thing in his time, making Pieter Bruegel a pioneer of the genre
painting and a prime source iconographic evidence about certain aspects of the
social life in the 16th century. The correct answer is D, subject matter.