Answer:
D.) The reaction yields something.
Step-by-step explanation:
A.) is incorrect. A forward arrow means a reaction only occurs in the forward direction (reactants to products). If the reaction were reversible, there would be double arrows, one pointed forward and another pointed backwards. This would symbolize that the reaction can take place in both directions.
B.) and C.) are incorrect. The direction of the arrow in a reaction gives no information regarding the rate of the reaction.
D.) is correct. In the case of chemical reactions, to yield something means to create something. A forward arrow indicates that reactants are undergoing a chemical reaction to form/yield new products.