The endocrine system sends signals over long distances. So, the correct option is A.
What is the endocrine system?
It is a system made up of different types of glands. These glands work by secreting various types of hormones which target specific functions of our body.
The synthesis of hormones takes place in glands but their effects are seen at a site distant from its glands. They travel from their site of synthesis to the site of action through blood or the intercellular fluid.
The target cells respond even to the smallest quantity of hormones and hormones are able to elicit a response even at the genetic level.
The time taken by hormones to complete their course of action is long which includes their synthesis, transfer to the target cell, entry into the cell and then finally showing effect. Hormones take longer to work but their effects are also long-lasting.
The nervous system responds quickly with the help of neurotransmitters and it requires an external stimulus. These responses are quick but the effects aren't long-lasting.
Therefore, the correct option is A.
Read more about the endocrine system here
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