OG11 CR-9有不明白处，请牛人赐教

Mayor：in each of the past five years， the city has cut school funding and each time school officials complained that the cuts would force them to reduce expenditures for essential services。but each time，only expenditures for nonessential services were actually reduced。so school officials can implement further cuts without reducing any expenditures for essential services。

which of the following，if  true，most stronly supports the mayor’s conclusion/

其中选项CD我不明白：

C、price estimates quoted to the city’s schools for the provision of nonessential services have not increased substantially since t he most recent school-funding cut。

d、few influential city administrators support the funding of costly nonessential services in the city’s schools。

OG对于此两选项的解释我不明白：对于C的解释是these price estimates are irrelevant since the argument is about expenditures for essential services。   对于D的解释是the argument is about possible cuts in esential services，not in nonessential services。

请帮我分析一下，好吗，先谢了