Answer: Maria's statement is elastic
Explanation: Only Maria's statement is elastic. Demand is said to be elastic when the computed elasticity is greater than 1. This indicates a high responsiveness to changes in price. Maria requires $10 worth of gas irrespective of the amount she'd be given for it. As a result her expenditure on gas is fixed and has no effect on expected revenue which shows that her elasticity is equal to one. A proportionate decrease in demand would cause a proportionate increase in price.