According to Text 2, wave-power is, at present,

✂️ a) a cost-effective form of generating energy.

✂️ b) cheaper than wind power but more efficient.

✂️ c) a renewable form of energy only for beach houses.

✂️ d) at a developmental stage and commercially unviable.

✂️ e) the only possible alternative energy source for Portugal.

Responda: According to Text 2, wave-power is, at present,