[单选题]
If the half-life of a material is 45 years, how much will bx d7j/)sxu6 unrf ekw:,8a0e eec( e-x nl f8+2j awff3:saacmej-lds9q)3d(b left after 100 years? 32l 3fdj8fcm- f)ea-a(qawe lx9jsd: scbn(+
A. more than 1/2
B. less than 1/2
C. more than 1/4
D. less than 1/4
