Final answer:
67Ga is a gallium isotope that is formed as a result of a nuclear reaction involving zinc and is referred to as the daughter product. The correct option is D) Daughter product.
Step-by-step explanation:
The notation 68Zn (p, 2n) 67Ga describes a nuclear reaction where a zinc isotope (with mass number 68 and atomic number 30) absorbs a proton (p) and emits two neutrons (2n), resulting in the formation of a gallium isotope (with mass number 67 and atomic number 31).
In this context, 67Ga is referred to as the daughter product of the nuclear reaction. Thus, the correct answer to the question, "What is 67Ga called?" is D) Daughter product.