Read the following context and choose the best option to answer the question.
Context: First off , the crab that did this changed his shell last week finally ! anyways today I went to feed them and I lifted the hut ! I found the crab that just change have one of my other crabs shells and my other crab was running around naked . The crab that got my other crab out of his shell was not changing into it he was just holding it my crab that has no shell right now will not go into a shell not even his own which the other crab disregarded .
Question: Why does the crab appear a bit different ?
Options: 
- It has changed it 's size by growing .
 - It has changed it 's skin .
 - It has lost a leg .
 - It has lost a claw .


It has changed it 's skin .