Whenever you make a payment or transaction in the Bitcoin system, you can optionally include a small transaction fee that it will go to the miner of whatever block includes that payment. The reason is

Group of answer choices

to make it easier for miners to mix your payment with other payments with no transaction fees

to incentivize miners to include your payment into the next block

to expedite the mining process and ensure that the block will be created in $10$ mins

to lower the threshold or target level of the nonce