Answer:
a. If I save enough money, I can buy a car soon.
Step-by-step explanation:
A conditional mood is when one factor depends on another. In other words, a conditional mood is when the validity of one proposition depends on another condition.
Among the given sentences, a conditional mood is seen in the sentence (a). The use of the words "if" presents a condition for the sentence. By saying "if I can save enough money", the speaker presents the possibility of buying a car. Thus, the chances of getting a car depend on the condition that enough money is saved.
Thus, the correct answer is option a.