Final answer:
Gender is not ordinarily classified as a BFOQ because it only applies in specific circumstances where privacy concerns or the essence of the business are affected, unlike education, certification, and licensing which are common qualifications for ensuring worker competence.
Step-by-step explanation:
Bona fide occupational qualifications (BFOQs) are specific requirements considered necessary for performing a job and may legally exclude certain individuals from employment opportunities, where such exclusion would otherwise be considered discrimination. Common examples of BFOQs typically involve gender, religion, national origin, and age. However, when it comes to the particular options provided in the question: Gender (A), Education (B), Certification (C), and Licensing (D), Gender is the one not ordinarily classified as a BFOQ. This is because gender-based BFOQs only apply in very specific circumstances, such as privacy concerns or when the essence of the business operation would be undermined by hiring the other gender. On the other hand, education, certification, and licensing are typically necessary for ensuring the competence and quality of workers in various professions and are thus commonly classified as BFOQs.