4a) 

Identify and rank the top three renewable sources of energy shown on the graph from highest to lowest
Identify: Provide an answer from a number of possibilities
(My Answer is the first comment)

Mark Scheme:

The top three are: Biomass, Hydro and Geothermal, in that order [2 marks]. 

Award [1 mark] if all three are identified, but not ranked correctly, or if any one of the three are incorrectly identified. No credit may be given if only one of the three is correct.