Answer:
[tex](A)5+2.75S\leqslant21[/tex]Explanation:
The price of a train ticket consists of an initial fee of $5 plus a fee of $2.75 per stop.
Let S represent the number of stops that Julia buys.
Therefore, the price of S stops will be:
[tex]5+2.75\cdot S[/tex]Since Julia has $21, it means the total cost of her ticket must either be less than or equal to $21.
Therefore, the inequality which describes this scenario will be:
[tex]5+2.75S\leqslant21[/tex]The correct option is A.