answer is option c.
explain it
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As there are total 3 electrons in valence shell of Boron and all are bonded to halides so central atom has no lone pair and all the bonded molecules in particular halide is same so there would be equivalent hybrid orbitals and they are incline to each other at an angle of 120° and there is no distortion due to lone pair.
because all are of sp3 hybridisation