请选择CBA7B2b)U3W5V,V/a2{2`;D*`5v.[8d/y.C.d ---Sam had too many biscuits yesterday, today he has got a stomachache.1X7L3F)~8o,y8K;\6h.o
A. so1X7L3F)~8o,y8K;\6h.o
B. because1X7L3F)~8o,y8K;\6h.o
C. or1X7L3F)~8o,y8K;\6h.o