Which of the following types of boundaries is most likely to result in a subduction zone?
a. divergent
b. convergent
c. transform
d. all of the above

Convergent zones (B) are most likely to result in a subduction zone. When two plates are described as being convergent this means that they are moving directly towards each other and in this situation one of the plates can be pushed under the other. Divergent is where two plates are moving away from each other and transform are where the two plates are sliding past each other, neither of which are likely to result in a subduction zone. B is the correct answer.

Hope this helps :)