What is the current default limit on the data transfer per distribution in Cloudfront?

Answer options:

A.150 Gbps
B.100 Gbps
C.200 Gbps
D.500 Gbps

Answer - A
 This is given in the AWS documentation 
Entity Default quota
Data transfer rate per distribution
150 Gbps
For more information on the limits , please refer to the below link:
http://docs.aws.amazon.com/AmazonCloudFront/latest/DeveloperGuide/cloudfront-limits.html#limits-general