What defines a conspiracy in legal terms?

In legal terms, a conspiracy is defined as an agreement between two or more people to commit a criminal act, specifically a felony crime. For a conspiracy to exist, there must be a shared intention to engage in criminal conduct and some overt act taken towards the commission of that crime. The element of "knowingly planning with another" highlights the collaborative aspect of conspiracy, which distinguishes it from mere thoughts or intentions without agreement or action.

When considering the other options, the option about planning to commit a misdemeanor doesn't meet the legal definition of conspiracy, which typically involves felonies given their seriousness. The idea of desiring to commit a crime without any action does not fulfill the requirement of agreement or intention to carry out the crime. Lastly, a passive agreement implies a lack of commitment or action towards the crime, which also falls short of the necessary elements that constitute a conspiracy. Therefore, the correct answer reflects the essential components of conspiracy in a legal context.