"Insolence" refers to rude or disrespectful behavior, often in the form of impudence or arrogance.
The opposite of "insolence" is "servility," which refers to the behavior of being overly submissive or obedient, often in a deferential manner.
"Insipidity" (2) refers to something dull or lacking in flavor, which is unrelated to insolence.
"Oboe" (3) is a musical instrument and has no connection to the concept of insolence.
"Infuse" (4) means to introduce a quality or element, which is also unrelated to insolence.
Conclusion:
"Servility" is the correct antonym for "insolence," as it implies submissiveness in contrast to arrogance.