C. stand by
Feedback stand by - 1. to do nothing to help someone 2. to keep a promise 3. to be on somebody's side and support them 4. to be ready to do something.
run across - to meet somebody by chance.
pick up - 1. to lift something or somebody up 2. to tidy something 3. to get something 4. to collect 5. to learn 6. to notice.
take out on - to behave badly towards somebody even without any reason