Select the most appropriate meaning of  the given idiom.

Green light

To permit something to proceed

The most appropriate meaning of the idiom "green light" is (3) To permit something to proceed.

The other options do not fit the meaning of the idiom.

• To be lost and confused can be to be in a fog or to be clueless.
• To misunderstand can be to misinterpret or to misconstrue.
• To always compare can be to be judgmental or to be critical.