Which of the following best describes this situation: 'Amazon's ability to recommend books to you based upon what other people with similar interests bought in the past gets better as it tracks more and more people who enter search queries and make purchases.' ?

A) Crowdsourcing.
B) Network effect.
C) Collective intelligence.
D) Algorithmic tracking.
E) None of these.

Network Effect

The phenomenon whereby a product or service gains additional value as more people use it, enhancing its utility and attraction.

Collective Intelligence

The shared or group intelligence that emerges from the collaboration, collective efforts, and competition of many individuals and appears in consensus decision making.

Algorithmic Tracking

The use of algorithms to monitor, analyze, and respond to data patterns, often for purposes like tracking user behavior or optimizing digital experiences.