ORDERD: deltasone 7.5 mg now - AVAILABLE: deltasone 2.5 mg scored tablets - How many should you give ?

ORDERD: deltasone 7.5 mg now .
AVAILABLE: deltasone 2.5 mg scored tablets .
How many should you give ?
a. 3  tablets
b. 1  tablets
c. tablets ½ 2
d. tablets ½ 1