YC Strong Preference for B2B Companies

Looking at the stats from the summer 19 batch, the highest category, over 1/3, was B2B.

Looking historically:

2019- https://blog.ycombinator.com/yc-summer-2019-batch-stats/

2018 - https://blog.ycombinator.com/yc-winter-2018-stats/

2017- https://blog.ycombinator.com/yc-summer-2017-stats/

There is definite trend in B2B (for those seeking entry, hint drop there). Is there a particular reason behind this?

- More exciting companies?

- Less risky companies?

- B2B has better valuations?