from deduction rules (http://aptitude.gateoverflow.in/2346/cat1999-125)
option A ) 1 All good people are knights , good people distributed term , knights non distributed
2. All warriors are good people, warriors distributed , good people non distributed
given conclusion : All knights are warriors. , which is not correct bcoz it does not follow 7th rule , knights is not distributed term in premise but here in conclusion it is distributed ( 2.1 rule form ) but it must be non distributed in conclusion also .
option B ) 1. No footballers are ministers , footballers distributed , ministers also distributed from( 2.3)
2. All footballers are tough, footballers distributed , tough not distributed (2.1)
given conclusion : Some ministers are players. which is false , becoz it does not follow rule 4 ) if one premise is negative the conclusion also in negative .
option C) 1. All pizzas are snacks
2. Some meals are pizzas
given conclusion : Some meals are snacks. which is correct , following all the rules .
option D) is also true , follow all rules
so option C and D are correct conclusion . hence option 1) is correct