I am just practising some English grammar related questions, here is the question I am confused about :
**question:** Identify the one bold word or phrase that must be changed in order for the sentence to be correct.

> 1) **In** supply-side economics, a balanced budget **results** from
> **reducing in** government **spending**.
> 
>  A. in
> 
>  B. results
> 
>  C. reducing in
> 
>  D. spending

Its correct answer is D. spending. But why should we select "spending" as wrong word that must be changed in order for the sentence to be correct.
what's the logic or rule behind it?

>   2) Alligators **are** **not long** **on** **the endangered** list.
> 
>  A. are
> 
>  B. not long
> 
>  C. on
> 
>  D. the endangered

Its correct answer is  B. not long. Why?