A university study published in an academic journal sampling 1,835 adults conducted in 2015 combined with statistical data on business trends over time.
Explanation:
The university study was produced through extensive research, including the presence of a large number of volunteers and a thorough analysis of statistical data. With that, we can say that this is the most reliable source, among the sources presented. This is because this source, in addition to having scientific evidence on, presents impartial arguments resulting from research and not an opinion.
