A bracket is a fitting that holds a shelf firmly against a wall, giving it support. The pair links a support piece to the structure it holds up. A strut works the same way for a rafter, bracing it in a roof frame.
The correct option is Rafter, the structural member that a strut is built to support.
If the price of a commodity increases by 25%, by what percentage should the consumption be reduced to keep the expenditure the same?