Option A - INCORRECT.
This option is so true but, it does not suggest a conclusion to the above argument. It is absolutely certain that the success of any design firm is based completely on its staff since the product it provides is creativity itself and only creative minded people should be welcome into the business.

Option B - INCORRECT.
It is not all designers after the age of 45 that are usually in positions of management, some can still function well as a designer because not all customers want the new styles created by recent designers some still wants some old school mouth-watering styles.

Option C - INCORRECT.
A little beat of disagreement to the said statement in this option. For some creative designers, their ability to be effectively creative depends on their age while some it isn't. Therefore, within the said age groups, older designers, thanks to their acquired experience and style, are more creative in designing costumes for people within their age group, meanwhile, younger designers are more creative in designing new costume ideas invoke for people within their age bracket and above.

Option D - INCORRECT.
Ability to be creative also sometimes depend on individual intellectual and not just age. Therefore, it is wrong to say that, designers with less than ten years of experience are more creative than designers with more than ten years of experience.

Option E - CORRECT.
This option is absolutely correct and best complete the suggestion in this argument. Design firms should be more open-minded when considering the employment of recently graduated designers, because experience sometimes is not an accurate measures to determine the intellectual and creative ability of designers. Some designers are with or without experience gifted with creativity, and when design firms place heavy emphasis on experience they might be loosing out some more creative designers who are without the required years of experience but are future creative directors.