John and Bob are going to court. John says Bob failed to pay him for a racing bike, while Bob says John gave it to him as a gift. What type of case is this, and what are the possible verdicts?

a. This is a criminal case. The jury can rule that Bob is liable or not liable.
b. This is a civil case. The jury can rule that Bob is liable or not liable.
c. This is a civil case. The jury can rule that Bob is guilty or not guilty.
d. This is a criminal case. The jury can rule that Bob is guilty or not guilty.