The correct answer is B. Heterogeneous.
All labor is heterogeneous because it is performed by different people with different skills, abilities, and experiences. This means that the value of labor will vary depending on the individual worker’s productivity.
Option A, homogeneous, is incorrect because it suggests that all labor is the same. This is not true, as labor can be performed in a variety of ways and with different levels of skill and effort.
Option C, lazy, is incorrect because it suggests that workers are not motivated to work hard. This is not always the case, as many workers are highly motivated to perform their jobs well.
Option D, intelligent, is incorrect because it suggests that all workers are equally intelligent. This is not true, as workers have different levels of intelligence and skill.
In conclusion, the correct answer to the question “All labor is” is B. Heterogeneous.