44. The HBr synthesis is thought to involve the following reactions:

a. Br₂ → 2 Br‧

b. Br‧+ H₂ → HBr + H‧

c. H‧+ Br₂ → HBr + Br‧

d. H‧+ Br‧→ HBr

e. 2 Br‧→ Br₂

f. 2 H‧→ H₂

The chain propagation reactions in this mechanism are reactions
(A) a
(B) b, c
(C) b, d, e
(D) d, e, f
(E) b, c, d

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