Which of the following support first law of thermodynamics? 

First law of thermodynamics states that the energy can neither be created nor destroyed but it is just transferred.

The solar energy is captured by plants and it flows through different organisms of an ecosystem. All organisms are dependent for their food on producers, either directly or indirectly. This is an unidirectional flow of energy from the sun to producers and then to consumers. It supports the first law of thermodynamics.