Answer:option A is the correct answer.
Step-by-step explanation:
Let x represent the number of days the customer paid for pet sitting.
She charges a flat service fee of $20, plus $20 per day. This means that the total amount that she charges for x hours would be
20 + 20x
If one of her customers spent less than $80, then the inequality that could be used to solve for x would be
$20 + $20x < $80