The correct answer is: Only II is implicit.
The statement is an advertisement for Bank X, which offers a home service that allows customers to open a bank account without having to go to a branch. This suggests that Bank X is trying to attract customers by offering a convenient service. However, the statement does not provide any evidence to support the other two assumptions.
Assumption I is that no other bank makes available service at the doorstep of the customer. This assumption is not implicit in the statement, because the statement does not mention any other banks. It is possible that other banks also offer a home service, but Bank X is simply trying to highlight its own service.
Assumption II is that people may choose Bank X for their financial transactions. This assumption is implicit in the statement, because the statement is an advertisement for Bank X. The statement is trying to persuade people to choose Bank X for their financial transactions.
Assumption III is that nowadays banking has become very competitive. This assumption is not implicit in the statement, because the statement does not mention anything about the level of competition in the banking industry. It is possible that the banking industry is very competitive, but the statement does not provide any evidence to support this claim.
Therefore, the only assumption that is implicit in the statement is assumption II.