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

the correct answer is modern american cars are not available due to trade restrictions.

trade between cuba and the united states have serious restrictions. the u.s. imposed an economic embargo on cuba, that among other things means that modern american cars are not available due to trade restrictions.

in response to some governmental actions of the authorities from cuba, president john f. kennedy proclaimed an embargo on trade between both countries in february 1962. the trade embargo remains active until this day and was implemented directly by the departments of commerce and the department of treasury.

in president trump’s administration, there is a national security presidential memorandum that "strengthens the policy of the u. s.", affecting trade with cuba.