This question tests the understanding of natural selection and its mechanisms. The correct answer is 'C' because the statement directly refers to the reduction in the influence of natural selection due to the change in male mortality rates. Option 'A' is incorrect because it is a generalization that is not supported by the passage. Option 'B' is incorrect because it misinterprets the statement to mean there are no differences in survival rates, which is not the case. Option 'D' is incorrect because it suggests a halt in evolution, which is not directly implied by the statement.