The correct answer is (b) Coniferales.
Coniferales is the most advanced order in Gymnosperms because it has the most diverse range of species and the most complex life cycle. Conifers are also the most successful group of Gymnosperms, having adapted to a wide range of habitats and climates.
Cycadales are an ancient order of Gymnosperms that are now found only in tropical and subtropical regions. They have a relatively simple life cycle and are not as diverse as conifers.
Gnetales are a small order of Gymnosperms that are found in tropical and subtropical regions. They have a more complex life cycle than cycads, but they are not as diverse as conifers.
Taxales is an order of Gymnosperms that is found in temperate and tropical regions. They have a simple life cycle and are not as diverse as conifers.
In conclusion, Coniferales is the most advanced order in Gymnosperms because it has the most diverse range of species and the most complex life cycle. Conifers are also the most successful group of Gymnosperms, having adapted to a wide range of habitats and climates.