Its D. Oil is decomposed material aged over time.
Answer: Women in particular may have practical reasons for carrying on the head, as for many African women it is "well-suited to the rough, rural terrain and the particular objects they carry—like buckets of water and bundles of firewood", then abandoning the practice when they migrate to urban areas where their daily routines ...
Explanation:
when two air masses coming together the boundary between the two is called a weather front
