The correct answer is: Only I and III are implicit.
The statement “Join X-tuition classes for sure success. Excellent teaching by excellent teachers is our strength.” is an advertisement. Advertisements are designed to persuade people to buy a product or service. In this case, the advertisement is trying to persuade people to join X-tuition classes.
The first assumption, “Sure success is desirable,” is implicit in the statement. The advertisement is saying that if you join X-tuition classes, you will be successful. This implies that success is something that people want.
The second assumption, “Students expect sure success when they join any tuition class,” is not implicit in the statement. The advertisement does not say anything about what students expect when they join a tuition class. It is possible that some students expect sure success, but it is also possible that some students do not expect sure success.
The third assumption, “Just having excellent teachers does not ensure success,” is implicit in the statement. The advertisement is saying that X-tuition classes have excellent teachers, but it is also saying that you will be successful if you join X-tuition classes. This implies that excellent teachers are not enough to ensure success.
Therefore, the only assumptions that are implicit in the statement are I and III.