You are presented with the question "What had to bend to form the Himalayas?" and the following answer choices: 
- bamboo
 - smaller mountains
 - an object
 - light
 - rock layers
 - graptolites
 - four limbs
 - sediment

Now knowing that the Himalayas were formed by rock folding and folding A fold is a bend in the rock layers, choose the best answer.


 

     rock layers    