The correct answer is (c) T1.
Explanation: In a trophic pyramid, the lowest level (T1) represents the producers, which have the most energy available because they directly capture energy from the sun through photosynthesis. As you move up the pyramid to higher trophic levels (T2, T3, T4), the amount of energy available decreases due to energy loss at each level through metabolic processes.
Why other options are incorrect:
(a) T4:
T4 represents the highest trophic level in the pyramid, which has the least amount of energy available due to the significant energy loss at each previous level.
(b) T2:
While T2 is higher than T1, it still has less energy available compared to the producers at T1.
(c) T3:
T3 also has less energy than T1, as it is a higher trophic level with more energy losses through the food chain.