I am just very confuse is this correct?

Consider the following graph. Price ($/unit) 10 OHNWAUOVOID D. 0 10 20 30 40 50 60 70 80 90 100 Quantity (units) When P = $2, the (unsigned) price elasticity of demand for demand curve D1 is and that for D2 is O (a) 1; 1 O (b) 1;3 O (c) 1; 1/2