Question

A circular series of chemical reactions that uses carbon dioxide from the air and produces energy-rich sugars is known as
A.the water cycle.
B.the Calvin cycle.
C.the nitrogen cycle.
D.the carbon cycle.

Answer 1

B: the Calvin cycle
It takes in carbon dioxide from the air in the carbon fixation stage
and then makes glucose (at a slower rate than light reaction)

The other 3 options are not really related to sugar.. so yea, the answer is B