Answer:
Its the last one, Wait until the right moment to carry out a plan
Explanation:
Think of it like this
Internal: A force inside yourself
External: A force outside of yourself
So if there an external force, it’s a force from outside so an example would be bullying. You wouldn’t want to go where you are being bullied so that would be an outside force affecting you.
A.
a-
ppreciate
only after appropriate syllables do you hyphenate