Clutch?, clutch wouldnt engage Options

[95celly]

Yesterday i was driving about to merge onto I-95 when i noticed that i couldnt accelerate in any gear. I was in fifth going about 65 and when i accelerated the RPMs went up to about 5000 and the car wouldnt accelerate. I Put it into fourth and the same thing happened so i pulled onto the shoulder and turned the car off and back on. Then i put it into first and tried to merge back into traffic but the car wouldnt move. I shifted into first and the RPMs went up tp around 4 or 5k and the car just sat there. I tried again and no luck. I then got towed back home but not sure if it was the clutch that went or what exactly it is that happened. I have a feeling it's the clutch but not sure if I need to replace the entire clutch, just the master cylinder, slave cylinder, etc. or if not the clutch at all. Has anyone else had this problem or have any ideas whether its the clutch or some other problem?