Which of the following is most accurate?

a. Less than half of people in the U.S. state that they believe in God.
b. There has been a gradual decline in the number of empirical journal articles on religion or spirituality in the past few decades with the shift toward brain science.
c. Overall attendance and membership in religious organizations have dropped in the U.S. over the last 50 years.
d. Spirituality and religiosity are basically the same constructs and are usually measured with the same questionnaires.

c