Answer - (C)
The effective address is like a house number, but for computer memory. The TLB is like a phone book that tells you which physical address (the actual location of the house) corresponds to each effective address.
Before you can access data in the TLB, you need to know the effective address. This is like finding the house number in the phone book. Once you have the effective address, you can look up the corresponding physical address in the TLB.
If the effective address is not in the TLB, you need to look it up in the page table, which is like calling the post office to get the address. This can take a while, so it's best to try to keep the TLB up to date.