单选题
[阅读理解]The ISU won't finally approve the new system until it meets in June but already UK Sport， the British Government's sports body， has expressed reservations. “I remain to be convinced that the random selection system would offer the guarantees that everyone concerned with ethical sport is looking for”， says Jerry Bingham， UK Sport's head of ethics（伦理）。
The attitude of those concerned in the UK to the new rules proposed by ISU can be best described as_____.
A.indifferent.
B.reserved.
C.enthusiastic.
D.positive.
正确答案：B
答案解析：根据本段第一句话可知英国对他们提出的新规则是持保留态度的。