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the answer is B
the electronic configuration of Phosphorus is 1s2 2s2 2p6 3s2 3p3
so three p orbitals are vacant.So for octet three more electrons are required.Flourine configuration is 1s2 2s2 2p5
so each flourine atom requires 1 electron for octet so three covalent bonds are formed.
and phosphorus has one lone pair in 2nd shell.
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