What is a benefit of link aggregation?

What is a benefit of link aggregation?
A . Saves bandwidth by restricting traffic to a specific potentially congested ISL
B . Improves performance by combining two or more parallel ISLs into a single physical ISL
C . Optimizes fabric performance by distributing network traffic across ISL
D . Improves ISL utilization by increasing the network traffic on a specific ISL

Answer: B