What causes one population in an intraspecific competition to reach carrying capacity?

If population X and population Y were the same species, the graph above would indicate that population Y had a
Question 35 options:
greater number of immigrants and emigrants than population X

higher birth rate and death rate than population X

higher birth rate and a greater number of immigrants than population X

higher death rate and a greater number of emigrants than population X

Answer: higher death rate and a greater number of emigrants than population X

Bio Man wrote:  If that were the case, the line would be decreasing rather than remain consistent.

Then what is the right answer?