Sir why 2nd option is correct?..as lymph contain platelets..

absolutely lymph contains few platelets,,,,,but sometime you have to select most supportive answer,,,,4th one is incorrect because it contains less plasma protein,,,lymph is not totally protein less,,,option 2 should be like that (Blood-RBC+few platelets+few salts+few protein),,it is also not technically correct,,but among all 4 option, 2nd one is most supportive