Final answer:
Based on the given information, we can conclude that Jack is a crossing gourd, but we cannot conclude that Pumpkin Pi is a crossing gourd.
Step-by-step explanation:
A conditional statement expresses the logical relationship between two propositions. In this case, the conditional statement is: 'If a pumpkin helps others across the road, then the pumpkin is a crossing gourd.' Based on the information given, a pumpkin named Jack helped Pumpkin Pi cross the road. We can conclude that Jack is a crossing gourd because he fulfilled the condition stated in the conditional statement. However, we cannot conclude that Pumpkin Pi is a crossing gourd because we were not given any information about Pumpkin Pi helping others across the road. Therefore, option b is a logical conclusion, but option a is not.