Here are the matches between the descriptions of nuclear decay in Column A and the types of nuclear decay in Column B:
Column A
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4/2 He : c. Alpha
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0/-1 E : b. Beta
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0/0 Y : a. Gamma
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Has a mass of 4, positively charged: +2: : c. Alpha
-
A negatively charged electron: : b. Beta
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An energy wave: : a. Gamma
So the matches are: 1 → c 2 → b 3 → a 4 → c 5 → b 6 → a