Frank & Lillian Gilbreth were:
Frank & Lillian Gilbreth were: (a) Brother-sister (b) Husband-wife (c) Teacher-student (d) None ✅ Correct option: (b) Husband-and-wife Explanation: They studied motion and ergonomics.
Frank & Lillian Gilbreth were: (a) Brother-sister (b) Husband-wife (c) Teacher-student (d) None ✅ Correct option: (b) Husband-and-wife Explanation: They studied motion and ergonomics.