Studies conducted on the churchgoers of Vanticana reveal that a mere 15% of the churchgoers in their 30s but over 60% of them in their 40s commit themselves to regular volunteer work. Churchgoers in their 30s comprise a huge fraction of the churchgoers of Vanticana, but this statistic has not led the church officials to be pessimistic in their predictions. They anticipate that the percentage of churchgoers who do regular volunteer work will likely not be worse off in a decade than it is today.
Which of the following, if true, provides the strongest grounds for the church officials' prediction?
A. Most churchgoers currently in their 30s who do not volunteer today did do volunteer work when they were younger.
B. People in their 30s become progressively more religiously inclined as they mature and are therefore significantly more likely to sign up for regular volunteer work.
C. The number of churches in the city of Vanticana and the attendance capacity of each church have been steadily increasing over the past few years and is expected to increase over the next couple of decades.
D. The incentives to volunteer – a free meal and a token of appreciation – are fewer today than were 10 years ago.
E. Even though a much larger proportion of the new churchgoers in Vanticana are likely to be younger in a few years than currently is, the new churchgoers are likely as dedicated to volunteering as the current lot is.