Elasticity/Demand Curves

44. In 1979, in a isolated small town, 100,000 bricks were sold at $1.20 per brick.  In 1980, 120,000 bricks were sold at $1.50 each in the same town.  This data could provide evidence of:
A) a totally elastic demand curve for bricks.
B) an unitary elasticity of demand for bricks.
C) a contraction in the supply of bricks over time.
D) a shift in the demand curve for bricks over time.
E) none of the above.