Which one is possible?
(a) ₇????¹⁹ + ₒ????¹ ➝ ₇????¹⁶ + ₁H¹ (b) ₁₆????³² + ₁H¹ ➝ ₁₇????????³⁵ + ₂H????⁴
(c) ₈????¹⁶ + ₒ????¹ ➝ ₇????¹⁴ + 3₁H¹ + 2 -₁????⁰
(d) ₁H¹ + ₁H¹ ➝ ₂H????⁴
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