The test is wrong.

COUNTABLE


Clocks are countable nouns (things that can be individually counted).  Countable nouns can be quantified with _few_ or _many._

Either of these sentences would be grammatically complete:

>There are many clocks in the office but **few** of them work properly.
>
>There are many clocks in the office but **many** of them work properly.  

The second sentence sounds a little awkward, due to the repetition of _many,_ but it is grammatically fine.  Maybe you asked your clock repairman if it would take a long time to repair all the clocks in the building.  He responds _"Not long - There are many clocks, but many of them are working fine [and don't need repair.]"_


UNCOUNTABLE 

Suppose instead you were discussing sand on the floor.  Sand is not generally thought of as countable, and you would use _little_ or _much_.

>There is a lot of sand in my goldpan but **little** of it is likely to contain any gold.
>
>The winds weren't too strong.  There is a lot of sand on the office but **much** of it was tracked in by the dog after the storm was over.