The core idea
Oil prices can affect bond yields through inflation expectations, household purchasing power, corporate investment and economic growth.
What is happening underneath
A supply-driven oil shock may raise inflation while weakening growth, creating a difficult signal for bonds.
How investors should read it
The effect varies between energy-importing and energy-exporting economies.
The same market move can carry different information depending on which maturity, issuer and risk premium is changing. Read the question together with the underlying concepts rather than treating one price move as a universal signal.