Option A is the correct answer because using Amazon CloudWatch metric streams with Amazon Kinesis Data Firehose to stream and store EC2 Auto Scaling status data in Amazon S3 is a fully serverless solution that efficiently handles the data transfer. This approach ensures that there is no impact on the speed of EC2 instance launches, as the data is streamed in real-time without the need for intermediate processing or additional infrastructure. Options B, C, and D involve additional processes or components that could potentially introduce delays or complexity, which can affect the quick launch of EC2 instances.