The fundamental principle of the scientific method is that extraordinary claims require extraordinary evidence. When an experimental result contradicts a well-established and extensively verified theory, the first and most critical step is to rigorously scrutinize the experiment itself. This involves checking the entire experimental setup for systematic errors, re-evaluating the data analysis, and, most importantly, having independent research groups attempt to replicate the results. This process of verification and replication ensures the integrity of scientific findings and prevents the premature dismissal of robust theories based on a single, potentially flawed, observation.

B. Changing data to fit a theory is scientific fraud and is antithetical to the objective pursuit of knowledge.

C. A single, unverified experimental result is not sufficient grounds to abandon a theory supported by over a century of evidence.

D. Ignoring data because it conflicts with existing ideas is confirmation bias and hinders scientific progress; anomalies must be investigated.

1. University of California Museum of Paleontology, Berkeley. "Scrutinizing the evidence." In Understanding Science. Retrieved from https://undsci.berkeley.edu/article/howscienceworks08. This resource explains that when faced with surprising results, the scientific community's first step is to carefully analyze and attempt to replicate the underlying evidence and methods.

2. Reich, E. S. (2012). "Finding fault in faster-than-light neutrino results." Nature. https://doi.org/10.1038/nature.2012.10099. This article documents the actual scientific process following the 2011 OPERA announcement, detailing how researchers re-examined the experiment and discovered technical faults (a loose fiber-optic cable and a faulty oscillator) that caused the erroneous result.

3. MIT OpenCourseWare. (2016). 8.01SC Classical Mechanics, Fall 2010. "Course Introduction and Newtonian Mechanics: The Scientific Method." Section 1.2. Retrieved from https://ocw.mit.edu/courses/8-01sc-classical-mechanics-fall-2010/resources/the-scientific-method/. This course material emphasizes that a key part of the scientific method is the cycle of hypothesis, prediction, and experimental testing, which includes verifying unexpected results.