Number Vs Amount

Number : Use with Countable Noun.  Example: number, few , fewer, many
Amount: Use with Uncountable noun. Example : quantity, less, little, much

The administration has increased the number of fines for mining safety violations as part of their campaign to protect miners.
has increased the number of fines for mining safety violations as part of their
have increased the number of fines for mining safety violations as part of their
has increased the number of fines for mining safety violations as part of its
has increased the amount of fines for mining safety violations as part of its
have increased the amount of fines for mining safety violations as part of their

OA : C