The correct answer is option 'A' - Wellington Cup.

The Wellington Cup is an International Cup for hockey. Here's an explanation of why this is the correct answer:

Wellington Cup:
- The Wellington Cup is a prestigious international hockey tournament.
- It is named after the city of Wellington, which is the capital of New Zealand.
- The cup is held annually and features teams from different countries competing against each other.
- It is recognized as one of the major international tournaments in the sport of hockey.

Samaranch Hockey Cup:
- The Samaranch Hockey Cup does not exist.
- There is no official international hockey tournament with this name.
- It might be a fictional cup or a cup that was previously organized but is no longer active.

MCC Cup:
- The MCC Cup is not an international cup for hockey.
- MCC stands for the Marylebone Cricket Club, which is primarily associated with cricket, not hockey.
- This cup does not exist in the context of hockey.

Agha Khan Cup:
- The Agha Khan Cup is not an international cup for hockey.
- The Agha Khan Cup is a prestigious field hockey tournament held in Pakistan.
- However, it is a national level tournament and not an international cup.
- It is named after the Agha Khan, who is the spiritual leader of the Ismaili Muslims.

In conclusion, the Wellington Cup is the correct answer as it is a recognized international cup for hockey. The other options are either non-existent or not international cups for hockey.