Which Excel formula should you use?

Note: This question is part of a series of questions that use the same scenario. For your convenience, the scenario is repeated in each question. Each question presents a different goal and answer choices, but the text of the scenario is the same in each question in this series.
Start of repeated scenario.
You are creating reports for a car repair company. You have four datasets in Excel spreadsheets. Four workbook queries load the datasets to a data model. A sample of the data is shown in the Data Sample exhibit. (Click the Exhibit button.)
Data Sample exhibit:




The data model is shown in the Data Model exhibit. (Click the Exhibit button.)

The tables in the model contain the following data:
• DailyRepairs has a log of hours and revenue for each day, workshop, and repair type. Every day, a log entry is created for each workshop, even if no hours or revenue are recorded for that day. Total Hours and Total Revenue column.
• Workshops have a list of all the workshops and the current and previous workshop managers. The format of the Workshop Manager column is always Firstname Lastname. A value of 1 in the IsLatest column indicates that the workshop manager listed in the record is the current workshop manager.
• RepairTypes has a list of all the repair types
• Dates has a list of dates from 2015 to 2018
End of repeated scenario.
You create a measure named Average Revenue Per Hour that calculates the average revenue per hour.
You need to populate a cell in a worksheet to display the Average Revenue Per Hour where Repair Type is Engine. Which Excel formula should you use?

A. Option A
B. Option B
C. Option C
D. Option D