If a represents the number of adults and c represents the number of children that attend the movie, which of the following systems of equations can be used to find the number of adults and children that attended the movie?

There are 125 adults and children attending a movie in a theatre. The cost for an adult to attend the movie is $5.75 and a child pays 3.50. The theatre raised $617.50 in total sales for the movie.

If a represents the number of adults and c represents the number of children that attend the movie, which of the following systems of equations can be used to find the number of adults and children that attended the movie?
A . a + c = 125 5.75a + 3.50 c = 617.50
B . 5.75a + 3.50c = 125 a + c = 617.50
C . a + c = 125 3.50a + 5.75c = 617.50
D . a + c = 617.50 3.50a + 5.75c = 125

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Answer: A