'Guidance' is an uncountable noun, so you cannot use an indefinite article before it.
So, the correct phrase is 'without proper guidance'. You could also say 'without some proper guidance' or 'without the proper guidance', but you can't say 'a proper guidance'.
Here's an idea. Why not check in a dictionary before you do these excercises?
If you look up 'guidance' in the Cambridge Learners' dictionary, for example, you'll see that it has a 'U' immediately after it, telling you that it is an uncountable noun.
Likewise, if you look up 'meeting', you'll see that it has a 'C' after it, telling you that it is a countable noun.
You don't need to ask us every time you have a query. Just look the word up in a dictionary and work it out for yourself. The rule regarding the use of 'a' with countable/uncountable nouns is very simple.