Question

the most likely reason countries have become more connected is they often
depend on each other for social systems.
need each other for loans and bail-outs.
depend on each other more for raw materials and finished products.
need each other for leadership.

Explanation:

In an increasingly globalized economy, the primary driver of cross-country connectivity is interdependence in trade. Most countries lack all necessary raw materials for production, and rely on importing these, while also exporting finished goods they produce efficiently. This trade-based interdependence creates the strongest and most widespread connections between nations, far more than the other listed options which are either narrow or less foundational.

Answer:

depend on each other more for raw materials and finished products.