Final answer:
All the adverbs mentioned, reasonably, generally, usually, appropriately, and approximately, contribute to ambiguity in a Software Requirement Specification because they introduce subjective and uncertain elements that can be interpreted in various ways.
Step-by-step explanation:
When documenting a Software Requirement Specification (SRS), ambiguity in requirements can arise from the use of certain adverbs. Adverbs such as reasonably, generally, usually, and appropriately introduce a level of uncertainty because they are subjective and can be interpreted differently by different people. Specifically, options A (reasonably), B (generally), C (usually), and D (appropriately) can make the requirements vague because they don't provide clear, concrete details. Furthermore, option F (approximately) introduces a numeric uncertainty, which can lead to different expectations about quantitative aspects of the requirements. The correct answer to which adverbs are the causes of requirements ambiguity is E, All of the mentioned, since any adverb that introduces subjectivity or uncertainty can lead to ambiguity in the SRS.