We need to match the common names of the plants in List-I with their correct scientific names in List-II.
(A) Sword bean is scientifically known as Canavalia gladiata. So, (A) matches with (IV).
(B) Ivy gourd is scientifically known as Coccinia indica (syn. Coccinia grandis). So, (B) matches with (III).
(C) Cowpea is scientifically known as Vigna unguiculata. So, (C) matches with (II).
(D) Snake gourd is scientifically known as Trichosanthes anguina. So, (D) matches with (I).
Therefore, the correct matching is:
(A) - (IV)
(B) - (III)
(C) - (II)
(D) - (I)
This corresponds to option (3).
(A) - (IV), (B) - (III), (C) - (II), (D) - (I)