设(x+1)4(x+4)8=a0+a1(x+3)+a2(x+3)2+…+a12(x+3)12，则a₂+a₄+…+a₁₂=______．

His desk-mate refused to help him cheat in the examination, which made him _____. [ ]

A. excited

B. relaxed

C. embarrassed

D. experienced