Ability and capability are used in the same context but actually can be used for the same meaning , if you are capable of doing something, then you have the ability to do it. Most times when some one once to define you, they ask will recommend you based on your ability and this is measured with past experience but capability is a question when they see the task ahead and they know your ability ,so ability is that capability to have to do something, it is not a skill or desire but capacity. So ability is a relative capability people have to perform a different range of task like option C stated.
