Which of the following is a nuclear fusion reaction?

• A
  $_1^2H + _1^3H \to _2^4He + _0^1n$
• B
  $_{92}^{238}U \to _{82}^{206}Pb + 8(_2^4He) + 6(_{-1}^0\beta)$
• C
  $_6^{11}C \to _5^{11}B + \beta^+ + \nu$
• D
  None of these