Compute Engine lets you purchase committed use contracts in return for deeply discounted prices for VM usage. These discounts are referred to as committed use discounts. Committed use discounts are ideal for workloads with predictable resource needs. When you purchase a committed use contract, you purchase Compute Engine resources-such as vCPUs, memory, GPUs, local SSDs, and sole-tenant nodes-at a discounted price in return for committing to paying for those resources for 1 year or 3 years. The discount is up to 57% for most resources like machine types or GPUs. The discount is up to 70% for memory-optimized machine types.

Google Kubernetes Engine GKE seems a better fit since the requirement is for "security need for fine-grained control of traffic between the containers" and "fine-grained control over scaling policies". Such level of control is easier on GKE that Cloud Run.
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Reference link- https://cloud.google.com/blog/products/containers-kubernetes/when-to-use-google- kubernetes-engine-vs-cloud-run-for-containers

Explanation
Option A is true
You are responsible for the licensing of all of your software. Bare Metal Solution uses a bring-your-own-license (BYOL) model.
Apart from this you are responsible for the software, applications, and data that you use and store in the Bare Metal Solution environment.
Responsibilities
Data, including:
- Security and encryption
- Backups
Software and applications, including:
- Installation
- Configuration
- Upgrades and patching
Operating system and any hypervisor, including:
- Configuration changes
- Upgrades and patching
Server clusters, including:
- Installation
- Configuration
- Maintenance
Licensing
Option B & C is also true.
With Bare Metal Solution, Google Cloud provides and manages the core infrastructure, the net-work, the physical and network security, and hardware monitoring capabilities in an environment from which you can access all of the Google Cloud services. The core infrastructure includes secure, controlled-environment facilities, and power.
The Bare Metal Solution also includes the provisioning and maintenance of the custom, sole-tenancy hardware with local SAN, and smart hands support.
The network, which is managed by Google Cloud includes a low-latency Cloud Interconnect con-nection into the customer Bare Metal Solution environment.
The available Google Cloud services include private API access, management tools, support, and billing.

https://cloud.google.com/network-connectivity/docs/direct-peering