Assume the following is a true statement:

If it is raining, I will carry an umbrella.

a. converse

b. inverse

c. contrapositive

d. biconditional

We analyze the statement: If it is raining, I will carry an umbrella. This statement can be true because one would surely depend on the weather so as to do not bring any unnecessary things anymore. When the statement is reversed. I will carry an umbrella if it is raining which still makes sense. Answer then is D