With reference to the Himalayan rivers joining the Ganga downstream of Prayagraj from West to East,
Which one of the following sequences is correct?
a. Ghaghara - Gomati - Gandak - Kosi
b. Gomati - Ghaghara - Gandak - Kosi
c. Ghaghara - Gomati - Kosi - Gandak
d. Gomati - Ghaghara - Kosi - Gandak