Your charge: look at what acquisitions the comparable companies have made, when, and how much money was involved.
For this, use the M&A Deals module in Thomson ONE.
Here are some screenshots to help you get into it.
The M&A Advanced Search menu looks like this:
In the screenshot above, I have already opened up the menus in the left window. When you click an item, that will open a second popup window that allows you to enter your search terms.