North is at the top. Gray shapes are land. Look at the continents beside a letter, then name that water. The five named oceans form one connected global ocean. A and F belong to the same ocean because the flat map cuts through it.
Worked example
Find South America, then move east into the water toward Africa. The water between those continents is the Atlantic Ocean. The two shores explain the location; its printed letter alone does not.
Explain before choosing
Before using the choices, name A through F aloud or on paper. Explain why two letters have the same name. A helper checks your explanation separately. This simplified flat map distorts sizes near the poles and omits some small islands; do not use it to compare continent sizes.