Step 1: Define "Speedball". The term "speedball" refers to a mixture of a stimulant and a depressant, typically an opioid, taken simultaneously, usually via injection. The question title "CNS depressant Speed balls" is slightly misleading; a speedball contains both a depressant and a stimulant.
Step 2: Identify the classic combination. The classic and most common combination for a speedball is heroin (an opioid depressant) and cocaine (a powerful stimulant).
Step 3: Evaluate the options. Option (3) correctly identifies this mixture. The other options are incorrect combinations.