Step 1: Understanding the Question:
The task is to choose the phrase from the list that best completes the given sentence.
Step 2: Analyzing the Options and the Sentence:
- The sentence expresses the idea that others' opinions should not overpower or silence our own thoughts.
- Signed off: Does not fit.
- drown out: means to be much louder than another sound, making it impossible to hear. This metaphorically fits the idea of opinions silencing an inner voice. The passage says, "Don't let the noise of other's opinions drown out your own inner voice."
- turned out: Does not fit.
- trapped by: Does not fit.
Step 3: Final Answer:
The correct phrase is drown out.
The complete sentence: We should not let the opinion of others drown out our own inner voice.