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Which of the following statement (s) is/...

Which of the following statement (s) is/are correct?
(a)In `BF_3`, there is `pπ-pπ` back bonding B and F.
(b)In `BI_3`, there is `pπ-pπ` back bonding B and I
(c) `pπ-pπ` back bonding makes `BI_3` least acidic among boron trihalides.
(d)`BI_3` is strongest Lewis acid among all the boron trihalides.

A

(a) and (c)

B

(a) and (d)

C

(b) and (c)

D

(b) and (d)

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