Directions: Given below are four jumbled sentences. Select the option that gives their correct order.

A: One such trip took them to the river Ganga in Rishikesh.

B: They climbed the mountains of the Himalayas, where it was very cold. 

C: Students went on vacation to many places of interest.  

D: They saw many kinds of trees on these mountains - oaks, pines and deodars, very different from the ones near their home on the plains.