Comprehensive and Detailed In-Depth Explanation:

The 'change curve' (based on Kübler-Ross’s model) describes emotional stages individuals experience during change: shock, denial, frustration, depression, experiment, decision, and integration. The APMG Change Management Foundation stresses proactive support to guide people through these stages effectively. Option A ("Actively involve line managers in listening and providing support") is recommended because line managers are well-positioned to offer personalized support, listen to concerns, and help staff navigate emotions—key to moving through the curve. Option B misinterprets negative emotions as a management failure rather than a natural response, Option C isolates individuals, and Option D is passive and unsupported by the framework.