Which of the following choices best explains why the author cannot say for certain how romantic love affects levels of serotonin in the brain? Answer choices for the above question A. There has not been a purely neurological study examining the relationship between the two. B. Some evidence suggests that romantic love increases serotonin and other evidence suggests it decreases serotonin. C. Serotonin does not have strong effects on the brain compared to dopamine and norepinephrine. D. There is a possibility that study subjects were not actually in love, but rather just suffering from obsessive-compulsive disorder.

It will be through raising high the prestige of your administration by success in short-range recovery, that you will have the driving force to accomplish long-range reform. on the other hand, even wise and necessary reform may, in some respects, impede and complicate recovery. what is the purpose of the transitional phrase on the other hand in this excerpt? a) it provides a counter-argument to the writer's main ideas. b) it provides a hypothetical situation for the reader to ponder. c) it provides additional evidence in favor of the writer's argument. d) it provides information about laws that are opposed to the writer's argument.