Given
To graduate, you must take at least 16 core credits and 9 elective credits and you can take no more than a total of 32 credits.
Answer
The minimum core credits are 16
[tex]C\ge16[/tex]The minimum elective is 9
[tex]E\ge9[/tex]Total credits are not more than 32
[tex]C+E\text{ }\leq32[/tex]Combining all these
[tex]C\ge16,E\ge9,C+E\leq32[/tex]Option A is correct