What happened in 2014 that made the ongoing civil war in Syria even more complicated?

(1 point)
Responses

The Arab Spring led to demonstrations in Syria.

The Arab Spring led to demonstrations in Syria.

The Assad government used chemical weapons.

The Assad government used chemical weapons.

ISIS launched an attack on Syria.

ISIS launched an attack on Syria.

The United States attacked a Syrian air base.

The Arab Spring led to demonstrations in Syria.

The Assad government used chemical weapons.
ISIS launched an attack on Syria.
The United States attacked a Syrian air base.