텝스문제입니다.to meet the increasing demand, the firm has been running its facilites twenty-four seven, and, consequently, it is expected to satisfy _________________________ .
(a) enough demand
(b) enough of demand
(c) enough the demand
(d) enough of the demand정답은 d번이라 하네요
이유와, enough 의 어순에 대해서 설명좀 부탁드려요