Ect the best answer for the question To add a data series to a chart from the Chart Tools contextual tab, perform the following steps:
A. Select Data > Data Group > Switch Row/Column.
B. Design Tab > Data Group > Switch Row/Column.
C. Design Tab > Data Group > Select Data.
D. Design Tab > Change Chart Type.

Option(A) is the correct answer to the given question .

Explanation:

Following the steps for adding the data series into the Chart Tools is given below

Step 1: Choose the data from the spreadsheet

Step 2: Choose the data button or data group.

Step 3: After that press on the add button.

Step 4:: Finally choose the range of the data from the excel sheet .

i guess the correct option is letter a.

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