Match the pairs of diseases and pathogens:
`{:("Column-I","Column-II"),(1." Malaria", a." Wuchereria bancrofti"),(2." Filariasis", b." Helminth"),(3." Typhoid", c." Plasmodium falciparum"),(4." Schistosomiasis", d." Salmonella typhi"):}`
A. 1-c, 2-b, 3-a, 4-d
B. 1-d, 2-a, 3-b, 4-c
C. 1-a, 2-b, 3-c, 4-d
D. 1-c, 2-a, 3-d, 4-b