Answer:
A). A cycle has begun in which personal computer users,
Step-by-step explanation:
The example provided here would best be accomplished and completed by option A, i.e. "a cycle has begun in which personal computer users". The other options exemplify either inappropriate context that does not support the previous claim or contain grammatical errors. For example in option B, pronoun "they" has no referent, while the last option displays an incorrect logical predication and option C and D depicts a confused or unclear assertion. Thus, this makes us conclude with option A as the answer as it best fits the passage both grammatically and logically.