Explanation/Reference:

The developer should use the Lightning:flow tag to display the flow in the Aura component. The Lightning:flow tag is a base Lightning component that allows you to embed a flow in an Aura component and interact with it programmatically. The Lightning:flow tag has attributes that let you specify the name of the flow, pass input values to the flow, handle the flow status change event, and control the flow navigation. The Lightning:flow tag supports only screen flows and autolaunched flows.
The other options are not valid tags for displaying a flow in an Aura component. There is no such tag as Lightning-flow or Aura:flow. The aura:component tag is the root tag of the Aura component hierarchy, but it does not display a flow by itself.
References: lightning:flow - documentation, Use Aura Components with Flows, Prepare for Your Salesforce Platform Developer I Credential

As of Winter '20 (API version 47.0), Salesforce introduced the ability to test Autolaunched Flows with test coverage.
However, as of the current knowledge cutoff (2023-09), there is no direct way within the Salesforce UI to check the test coverage of autolaunched flows before deploying them via change sets.
To check the test coverage of flows, developers can use the Tooling API to query for test coverage.
Option A: Use SOQL and the Tooling API.
Correct Answer.
Developers can use the Tooling API to query for Flow test coverage information.
By executing a SOQL query on FlowTestCoverage and FlowVersionView objects via the Tooling API, developers can retrieve coverage data.
This allows checking flow test coverage programmatically before deployment.
The Flow Properties page does not provide test coverage information.
It allows configuring flow settings but not checking test coverage.
Option C: Use the Code Coverage Setup page.
Incorrect.
The Code Coverage page in Setup pertains to Apex code coverage, not Flow coverage.
Option D: Use the ApexTestResult class.
Incorrect.
The ApexTestResult class is used for Apex test results.
It does not provide information on Flow test coverage.
Conclusion:
To check the test coverage of autolaunched Flows before deploying them in a change set, a developer should use SOQL and the Tooling API, which is Option A.
Reference:
Flow Test Coverage with Tooling API
Use Tooling API to Check Flow Coverage
Incorrect Options:
Option B: Use the Flow Properties page.
Incorrect.