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Choose the correct order for the energy ...

Choose the correct order for the energy barrier to rotation around the B-N bond:
[`R=CH_(3)` is all above cases]

A

`H_(2)B-NR_(2)ltBH(NR_(2))_(2)ltB(NR_(2))_(3)`

B

`B(NR_(2))_(3)ltBH(NR_(2))_(2)ltBH_(2)-NR_(2)`

C

`BH(NR_(2))_(2)gtB(NR_(2))_(3)gtBh_(2)-NR_(2)`

D

`BH_(2)-NR_(2)gtB(NR_(2))_(3)gtBH-(NR_(2))_(2)`

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