If Most Stars Are Low-Mass Stars, and Low-Mass Stars Typically

If most stars are low-mass stars, and low-mass stars typically eject a planetary nebula, why then do astronomers see relatively few planetary nebulae in the sky?

A) planetary nebulae can only be detected through their faint radio emissions
B) planetary nebulae are only visible when a planet surrounding the star plows through the ejected material, causing it to glow
C) planetary nebulae expand rapidly and soon become too faint to be visible
D) planetary nebulae quickly fall back onto the star produced them
E) while most stars are low-mass when they are born, throughout their lives they gather more and more material; so few stars are low-mass when they die