The correct option is A A - Caesalpinaeeae, B - Mimosaceae, C - Papilionaceae
All the three plants in the question belong to the family Fabaceae.
Caesalpinia pulcherima belongs to the the sub family Caesalpiniodeae or Caesalpineaceae.
Mimosa pudica belongs to sub family Mimosoideae or Mimosaceae
Pisum sativum (pea) belongs tothe sub family Papilionaceae.
Therefore, the correct answer is option A.