How many pins are there to a firkin?

Question

A40, two in each stave

B4, two in each ear

C2

DNone

Select from the options above.

Correct Option: 3  

Explanation:
2
A pin is a volume measurement for beer or ale, equal to 4.5 imperial gallons (20 l). A firkin is a volume or cask, also for beer or ale.