A 10.0 g sample of the compound L-erythrose 4-phosphate was dissolved in 20 mL of chloroform and the solution was placed in a cell with a 20.0 cm path length, an observed rotation of 100? was found. Calculate the specific rotation, [?]D for L-erythrose 4-phosphate?
A)-100 B) -10 C) 100 D) 10 E) 1