Recommend a solution to generate a monthly report of all new ARM resource deployments in your subscription. Which service is appropriate for collecting and querying deployment activity data for reporting?

Azure Log Analytics is the correct choice because it is designed to collect, index, and query log and telemetry data from various Azure resources, including Azure Resource Manager (ARM) deployment activities. You can use Kusto Query Language (KQL) within Log Analytics to filter for new deployments over a specific period and then generate reports. Application Insights focuses on application performance monitoring and telemetry, not ARM deployments. Azure Analysis Services is a fully managed platform as a service (PaaS) that provides data modeling capabilities for business intelligence, not raw log collection. Azure Advisor provides personalized recommendations for optimizing Azure resources, not a log querying service for deployments.