Final answer:
In the nuclear reaction 68Zn (p, 2n) 67Ga, the symbol 'p' stands for a proton, which is a subatomic particle with a positive charge.
The correct answer is option A) Proton.
Step-by-step explanation:
The symbol "p" in the nuclear reaction 68Zn (p, 2n) 67Ga stands for a proton. This type of reaction is a nuclear reaction where a proton is bombarded with a zinc nucleus, resulting in the emission of two neutrons and the production of a gallium nucleus.
It represents a type of nuclear transmutation where elements are transformed into other elements through the addition or removal of particles in the nucleus.
The correct answer is option A) Proton.