The correct increasing bond angle among BF3, PF3 and ClF3 follows the order
ClF3 < PF3 < BF3
BF3 is trigonal planar with an angle of 120∘, PF3 has a lone pair of electrons, the angle here is around 96∘. ClF3 has 2 lone pairs of electrons and has a bond angle of 90∘ - it is T shaped.