Answer : 3. "3"
Explanation :

In/from will replace into because – in (Prep.) is used for indicating within a place from (Prep.) is used for indicating source/origin into (Prep.) is used for indicating entry, inclusion, or introduction in a place Look at the examples given below : He walked into the room. The train was coming from Australia. They were bringing drugs in India, for which they were punished. Prosecute (Verb) : to officially charge somebody with a crime in court Hence, in/from Australia is the right usage.