Entries from hardcoded category Should be easy i thought. How can i display all entries from a section from a certain category?

This is my code now, but nothing shows up (screenshot bottomleft):

{% set category = craft.categories.slug('b2c').first() %}
{% set entries = craft.entries.section('homeBlocks').relatedTo(category).find() %}

{% for entry in entries %}
    {{ entry.title }}
    {% for cat in entry.businessSegment %}
        {{ cat }} 
    {% endfor %}
{% endfor %}


This code shows all entries (screenshot topleft), and you can see there are entries with b2c:

{% set category = craft.categories.slug('b2c').first() %}
{% set entries = craft.entries.section('homeBlocks').find() %}

{% for entry in entries %}
    {{ entry.title }}
    {% for cat in entry.businessSegment %}
        {{ cat }} 
    {% endfor %}
{% endfor %}




My Category Group is called Business Category (with handle "businessCategory"). It contains two categories:


b2c (slug "b2c")
b2b (slug "b2b")


The field handle used in the section "homeBlocks" is "businessSegment"

Where's the error? :)
Give this a try. I'm not 100% sure I've got my site set up the same, but I think it's close.

I have a category group called Categories. It looks like this:

Categories
    b2a    
    b2b
    b2c


I created a section called homeBlocks which is a channel (shouldn't matter).
Then on my entry, I have a Categories field with a handle of categoryOne.

On my template:

{% set category = craft.categories.slug('b2c') %}
{% set entries = craft.entries.section('homeBlocks').relatedTo(category).find() %}

{% if entries | length %}
    {% for entry in entries %}
        &lt;p&gt;{{ entry.title }}&lt;/p&gt;
    {% endfor %}
    {% else %}
        {# No entries found. #}
{% endif %}


I have created 3 entries within my homeBlocks channel, and I've assigned the 1st entry and the 3rd entry to b2c. 

Now I am seeing this when I view the page:

&lt;p&gt;Entry Three&lt;/p&gt;
&lt;p&gt;Entry One&lt;/p&gt;


EDIT

Sorry for the bad info - I think I understand what you are looking for now. I've updated my answer so give it another try.