Compiler design- Gate 2015

In the context of abstract-syntax-tree (AST) and control-flow-graph (CFG), which one of the following is TRUE?
A. In both AST and CFG, let node be the successor of node . In the input program, the code corresponding to is
present after the code cprresponding to
B. For any input program, neither AST nor CFG will contain a cycle
C. The maximum number of successors of a node in an AST and a CFG depends on the input program
D. Each node in AST and CFG corresponds to at most one statement in the input program

Option a is false. Can someone provide an example on that please .