The integration direction that the consultant should recommend for Career Services is C. Two-way integration between the event system and Salesforce1. This is because a two-way integration can allow for bi-directional data exchange and synchronization between the event system and Salesforce, which can enable Career Services to match student data in Salesforce with event attendance, career interest, and credit completion toward an academic major. A two-way integration can also help Career Services to segment and target students based on their engagement and preferences, and to measure the effectiveness and impact of their events and campaigns2.
Reference:
https://help.salesforce.com/s/articleView?id=sf.mc_co_marketing_cloud_connect.htm&type=5
https://trailhead.salesforce.com/en/content/learn/modules/marketing-cloud-connect