Augi Sells 300 Cat Toys Each Month When the Price

Augi sells 300 cat toys each month when the price is $5 per toy. When Augi lowered the price to $4, she sold 400 toys. The price elasticity of demand over the $4 to $5 range is approximately:

A) 0.78 and elastic.
B) 1.29 and elastic.
C) 0.78 and inelastic.
D) 1.29 and inelastic.