You pet your neighbor's dog and it bites you. this reaction is a . cost reward penalty

I think the correct answer from the choices listed above is the first option. You pet your neighbor's dog and it bites you. This reaction is a cost. You know the consequences of your actions. Hope this answers the question. Have a nice day.

I believe this would be a cost; there are benefits and costs for everything, a penalty would be a follow-up of the cost. 

The changes to agriculture in the united states since 1900 is that increased mechanization has increased food production, thereby increasing the need for labor. there has been an increased need for higher speeds of food production due the fact that the population in the united states continues to rise.