The Most Obvious Loophole in the Congressional Budget Act of 1974

The most obvious loophole in the Congressional Budget Act of 1974 is that

A) the projections on which spending is based are subjective.
B) the president can increase spending ceilings by reallocating other funds.
C) there is nothing in the process that requires Congress to tighten the government's financial belt.
D) its key section has been declared unconstitutional.
E) its key section and numerous applications have been declared unconstitutional.