Why did slaves have different experiences of working on plantations?

I'm not sure if this is 100% true, but its probably because slaves had less harsh daily work compared to other slaves because of their connection to the slave owner or if they were lighter skinned. I heard that light skinned slaves were better treated(but still suffered of course) but had less harsh works and were sent to clean the houses. I'm not 100% sure about this though

Explanation:

because slaves had masters whose personality was kinder or more mean than others

Explanation:

seeing as no choices were provided, i'll do my best to answer it from knowledge.

job specialization promotes work ethic to the person doing the job. he/she may be strong in the arms and able to lift things, specializing him/her in a job where you lift and carry.