Spearman’s g factor refers to

A. The genetic contribution to intelligence
B. A general intelligence the underlies successful performance on a wide variety of tasks
C. A highly developed skill or talent processed by a person with an otherwise limited mental ability
D. The ability to understand and regulate emotions

B. A general intelligence that underlies successful performance on a wide variety of tasks

Explanation:

Charles Spearman was a psychologist that proposed a theory of intelligence. According to his theory, there is a general intelligence that influences a person's performance when they do a variety of tasks. In other words, he proposed that there is a general intelligence. This general intelligence that underlies successful performance is known as g factor.

Therefore, Spearman's g factor refers to a general intelligence that underlies successful performance on a wide variety of tasks