Please help me understand the processes to solve this problem ASAP! :) This is extremely hard for me to understand!

1.5. Provide the starting material and each set of reagents to arrive at the major product shown for each reaction. reagent(s) starting material reagent(s) I III II Answer Choice a. b 1 H2, Pd/C Na, NH3 (lig), -78C H2, Pd/C LI, NH3 (lia), -78C H2, Lindlar Catalyst III H2, Lindlar Catalyst H2, Lindlar Catalyst Na, NH3 (lig), -78C H2, Lindlar Catalyst LI, NH3 (lig), -78C 2,5-dimethyl-3-hexyne 2,5-dimethyl-3-hexene 2,5-dimethyl-3-hexyne 2,5-dimethyl-3-hexene 2,5-dimethyl-3-hexyne C. d. e