Evolution through natural selection would not occur.
Explanation:
According to a different source, these are the options that are included in this question:
Less food would be available.
Organisms would evolve to increase variety.
Natural selection would operate faster.
Evolution through natural selection would not occur.
The only reason why evolution occurs is because the slight variations that are present among organisms allow some to become particularly well suited to a certain environment. Those who are particularly well adapted are more likely to pass their genes to the next generation. Therefore, these traits become more common and evolution occurs. If there was zero variation between organisms, then this process would not take place and evolution through natural selection would not occur.