After Conducting a Study on Happiness,researchers Realize That the Validity

After conducting a study on happiness,researchers realize that the validity and reliability of the study is not as strong as they had hoped.In essence,they haven't done as good a job of measuring happiness as they had hoped to.This means that

A) future researchers should improve on the reliability and validity of the current study by thinking through how to more accurately measure happiness.
B) the research is useless because it did not perfectly measure happiness.
C) the current project should not be trusted and future researchers should not replicate it;instead,they should start with all new measures.
D) no one should try to measure happiness because it cannot be done accurately.