**Detailed Answer**

Answer (C) is correct. The price elasticity is calculated by dividing the percentage change in quantity demanded by the percentage change in price. The numerator and denominator are both computed as the change over the range. Thus, the change in quantity demanded of 100 units divided by the sum of quantities demanded of 1,900 produces a quantity decrease of 5.263%. The price increase of $1 divided by the sum of the prices of $7 results in a price increase of 14.286%. Dividing 5.263% by 14.286% results in an elasticity coefficient of .3684, or .37 rounded.