For which of the following interest groups would the free-rider problem be most severe? 1. A small group with very concentrated possible benefits.
2. A large group with very diffuse possible benefits.
3. A large group with very concentrated possible benefits.
4. A small group with very diffuse possible benefits.

2. A large group with very diffuse possible benefits

Explanation:

the free-rider problem mostly applies to public goods that is goods or resources shared by a group of people. This problem is created when a burden arises from individuals sharing and using public resources who do not pay for them or sometimes underpays for it's usage . This problem could arise from small or large groups but would be most severe with large groups as these resources face heavier usage with large groups

answer; (d) one tectonic plate plunges beneath another; (most common,convergent boundaries)

it´s related to his charming character.

beauty is not everything, although we can joke that girls only care about the physical or material aspect, the truth is that a real woman looks at more important things, besides intelligence and personality, there are other attitudes that make irresistible to men who are 'unattractive'.

for example develop your sense of humor.