Which of the following is a positive statement?

To me

Recent scientific research in nutrition science is very interesting and will likely have a positive impact on at least $75\%$ of the population.

The development of artificial intelligence to predict online consumer purchasing behaviour is very concerning.

I believe that $100$ percent of my staff at my law firm are only interested in the facts of any particular case.

Data from a nationwide opinion survey revealed that $60$ percent of the population puts a high value on hard work.