What natural phenomenon does NOT hinder underwater acoustic transmission?

Acoustic transmission in underwater environments can be affected by various natural phenomena, each impacting sound waves differently. Solar prominences, which are large eruptions of plasma on the sun's surface, do not influence underwater acoustic transmission. This is primarily because the mechanisms that affect sound propagation underwater are localized to the specific marine environment and utilize physical properties of water, such as temperature, salinity, and pressure.

In contrast, ocean currents, underwater vegetation, and marine life can all obstruct or scatter sound waves, thereby hindering acoustic transmission. Ocean currents can create turbulence, altering sound paths, while underwater vegetation can absorb or reflect sound. Additionally, marine life often generates noise, which can interfere with the clarity and reach of acoustic signals.

Hence, the absence of influence from solar prominences on underwater acoustic transmission underscores why it is the correct choice in this context.