Why Are International Rankings of Educational Performance Problematic

Why are international rankings of educational performance problematic?

A) They can be misleading about actual differences between ranks, and provide little in the way of context.
B) Scores are based on other countries' definitions of what high performance is, rather than a US standard.
C) The companies that set the rankings are often lobbied by specific schools or regions to earn higher marks.
D) US students have greater access to classroom technology, which skews the scores and rankings.