x c. the tilt of the Earth's axis makes sunlight strike the northern hemisphere more directly in the summer d. 
(x c. the tilt of the Earth's axis; makes; sunlight strike the northern hemisphere more directly in the summer) Context(x c. the tilt of the Earth 's axis makes,List([0, 39))):(sunlight; strike more directly; T:in the summer)
x c. the tilt of the Earth 's axis makes,List([0, 39))
x c. the tilt of the Earth's axis sunlight
makes strike more directly
sunlight strike the northern hemisphere more directly in the summer
T:in the summer