What is a contraindication for eyelash extension application?

B is the correct choice because contraindications for eyelash extension application are specific conditions or factors that may make the procedure unsafe or unsuitable for an individual. Eye infections, severe allergies, and certain medical conditions affecting the eyes can pose risks during or after the application of eyelash extensions. For instance, an eye infection could exacerbate the condition, and applying extensions might lead to further irritation or complications. Similarly, severe allergies could result in adverse reactions to the adhesive or materials used in the extensions, while specific medical conditions may impair healing or recovery after the procedure, making it prudent to avoid applications until these conditions are resolved.

In contrast, while wearing cosmetic contact lenses (first choice) or mascara (third choice) may present some challenges for securing the extensions effectively, they do not inherently compromise the safety of the procedure itself. Additionally, recent eye surgery (fourth choice) could be a concern, but it is often considered a special case that falls under evaluation by the client's healthcare provider rather than categorized strictly as a contraindication unless certain complications are present. Therefore, the presence of infections, severe allergies, or specific medical conditions is a clearer contraindication that can directly impact the safety and efficacy of eyelash extension procedures.