Scientists have discovered the formation of phosphine in which planet?

The scarcity of loose hydrogen on Earth leads to the formation of phosphine, suggesting that its existence in other planets could be a potential indicator of life.

A team of scientists at Cardiff University in Wales, announced a new development in the search for life on Venus.

They have now detected phosphine in the planet’s atmosphere at a deeper level than their previous findings, which were reported in September 2020 and indicated the potential presence of life.

Hence, option 'A' is correct.