You can certainly populate information across forms using the frm-field-value shortcode as the default value for Forms B and C, but there are stipulations to make this work properly.
First, the user needs to be logged in to the site so the user id is associated with each entry,
Second, there can only be one entry per user per survey form. The format used with this shortcode is [frm-field-value field_id=x user_id=current]
If you have more that one entry per user per form, this shortcode will retrieve the first entry's value.
It would work best if everyone fills out the same form A first. This form can be used to to populate the others default values.
The default values will only work for new entries.
If any of the forms are edited, then you have to update the other forms with custom PHP fired in the [frm_after_update_entry](https://formidableforms.com/knowledgebase/frm_after_update_entry/) action.