To identify the vulnerable line in the given code, we need to understand what vulnerability we are looking for.
In this case, the code is establishing a database connection using JDBC. The vulnerability we are looking for is an SQL injection vulnerability, where an attacker can manipulate the SQL query being executed.
Looking at the code, we can see that the SQL query is being constructed in line #8 using a hardcoded username and password. This can be a potential vulnerability if the username and password are not properly validated or sanitized.
Therefore, the vulnerable lines in the code are Line #7 and Line #8.
The correct answer is C) Line #7 and Line #8.