Comprehensive and Detailed Explanation From Exact Extract:
IREB defines a set of RE principles. Principle 1 states that requirements are a means to an end (such as reduced risk and successful systems), not an end in themselves; they support achieving project and business goals. Principle 6 states that non-validated requirements are worthless because unvalidated statements may be incorrect, incomplete, inconsistent or misaligned with stakeholder needs. Requirements normally change over time; change is expected, not exceptional. Systems cannot be understood in isolation from their environment, and RE must consider all relevant stakeholders, not only users. Hence options A and D reflect official principles; the others contradict them.

Comprehensive and Detailed Explanation From Exact Extract:
Natural-language guidelines advise using active voice and a clear subject. The requirement currently focuses on the "option to change font color" being "displayed" rather than on what the system shall do, and includes spelling errors. Rewriting it as "The system Alfa shall display an option to change font color in its main menu" uses active voice, clarifies responsibility and fits recommended phrase templates. No universal quantifiers like "always" or "all" are present, no specific condition is needed, and there are no problematic nominalizations. Thus the primary defect is the passive, object-centred phrasing.