Explanation:

- Pierre van der Berghe focused on ethnicity and social stratification, but did not attempt to reconcile Marxist and functionalist views.

- Kingsley Davis (with Wilbert Moore) proposed the functionalist theory of stratification, not its reconciliation with Marxism.

- Melvin Tumin critiqued Davis & Moore's theory but was not known for reconciling Marxist and functionalist theories.

- Gerhard Lenski is notable for attempting a reconciliation, especially in his work "Power and Privilege," where he integrated elements from both Marxist (emphasis on class and power) and functionalist (emphasis on functional necessity) theories.

Options explained:

- Option 1 (1 and 2): Incorrect, as neither tried the reconciliation.

- Option 2 (2 and 3): Also incorrect, both functionalist/critique.

- Option 3 (1 and 4): Only Lenski tried, not van der Berghe.

- Option 4 (3 and 4): Correct. Melvin Tumin critiqued functionalism and Lenski attempted a synthesis, so they are closest to reconciliation efforts.