题目：各级政府正出台一系列措施，来有效解决最为迫切的老年人运用智能技术的问题。
A. All levels of governments are introducing strings of measures to effectively address the most pressing problems of the elderly in using smart technologies.
B. All levels of governments are introducing strings of measures to effectively address the most pressing problems of the elderly in using smart technology.
C. All levels of government is introducing strings of measures to effectively address the most pressing problems of the elderly in using smart technologies.
D. All levels of governments are introducing string of measures to effectively address the most pressing problems of the elderly in using smart technologies.
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