What is the confidence of the rule (gloves -> hat)?

Consider these itemsets: (hat, scarf, coat)
(hat, scarf, coat, gloves)
(hat, scarf, gloves)
(hat, gloves)
(scarf, coat, gloves)
What is the confidence of the rule (gloves -> hat)?

A.
75%

B.
60%

C.
66%

D.
80%