Sentences of a paragraph are given below in jumbled order. Arrange the sentences in the correct order to form a meaningful and coherent paragraph.

A. However, physical fitness and a stubborn fearlessness never let a climber fail.

B. The equipment can be made so light that no extra energy is spent in carrying it.

C. To a large extent, the physical difficulties can be reduced by paying attention to the equipment.

D. It is certain that weather plays an important part in the success or failure of mountain climbers.