There are two types of energy losses through pipes, major losses and minor losses. Major losses through pipes are due to _____________.

Correct option is B

 The major loss of energy or head is due to friction.
Minor losses:
 Minor energy (head) loss occurs in the following cases-
1. Loss of head due to sudden enlargement.
2. Loss of head due to sudden contraction.
3. Loss of head due to an obstruction in the pipe.
4. Loss of head at the entrance to a pipe.
5. Loss of head at the exit to a pipe.
6. Loss of head due to bend in the pipe, and
7. Loss of head in various pipe fittings.