which sentence displays correct subject-verb agreement
(a) the herd remain in the barn
(b) the have calves in the spring
(c) the herd is in north pasture
(d) the herd are milked each morning
(a) the herd remain in the barn
(b) the have calves in the spring
(c) the herd is in north pasture
(d) the herd are milked each morning