The best answer to this question would be (D) Being led astray by the “halo effect”.
Halo effect is defined as a type of cognitive bias where we are inclined to make ambiguous positive association on information which we perceive positively.
This is the case that is described in the question. We view the solutions implemented by other companies as excellent because we like the outcome that the companies manage to achieve by using these solutions. However, blindly implementing the same solutions in a different company might not yield the same results because of the various factors that we overlook since we are too preoccupied by the benchmarked “best practices” to pay attention to these other factors.