Can you please elaborate on your reasoning for calling the following answer incorrect:
"The number of Offers in the ‘Planned Offers’ and ‘Available Offers in Strategy’ need not be the same."
The excerpt from the video that you have posted actually establishes the point that the number of offers in the 'Planned Offers' NEED NOT match with the number of actual offers in the strategy.
By the way, I would like to point out that the version of the course you are taking is old. The exam associated with this version of the course will soon expire (please check http://www.pearsonvue.com/pegasystems/ for more details).