Which of the following is a breed of cattle?

Answer: Option A

Ayrshire is a breed of cattle.
The Ayrshire is a Scottish breed of dairy cattle. It originates in and is named for, the county of Ayrshire in south-western Scotland. Ayrshires typically have red and white markings the red can range from a shade of orange to a dark brown.
The Ayrshire is a medium-sized breed. The average adult individual "should weigh over 1,200 lb (540 kg) at maturity. Their milk production can reach 20,000 lb (9,100 kg) or greater per annum.