Which option would increase a radio channel's ability to carry signals?

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The ability of a radio channel to carry signals hinges on signal strength relative to noise and how much spectrum is used. Increasing transmit power raises the signal level at the receiver, improving the signal-to-noise ratio (SNR) and making reception more robust. Reducing the bandwidth lowers the total noise power in that band (noise power grows with bandwidth), so for the same signal power the SNR in the channel improves, making the signal easier to carry reliably. So, boosting power or narrowing the bandwidth both help the channel carry signals more effectively. Decreasing power or enlarging bandwidth generally makes reception harder because it either weakens the signal or increases the amount of noise in the channel.