Question 15.

Option A: {Each time the cuttlefish showed it could wait, the researchers tacked another ten seconds on to the next round of waiting before releasing the shrimp. The longest that a cuttlefish waited was 130 seconds.} The results of Schnell's experiment indicated that cuttlefish exhibit self-restraint. This was shown to be the case with few children in the original marshmallow experiments. Hence, Option A is correct. 

Option B: {Not every species can use self-control, but most of the animals that can share another trait in common: long, social lives.} The author does not imply causation between intelligence and sociability. He merely highlights these two attributes: self-control is considered indicative of intelligence, and most such organisms showcase social lives as well. Hence, B is a distortion and cannot be inferred.  

Option C: {Preliminary experiments showed that cuttlefishes’ favorite food is live grass shrimp, while raw prawns are so-so and Asian shore crab is nearly unacceptable.} The above lines depict a preference for certain kinds of food; thus, C is true.  

Option D: {Schnell [says] that the cuttlefish usually sat at the bottom of the tank and looked at the two food items while they waited, but sometimes, they would turn away from the king prawn “as if to distract themselves from the temptation of the immediate reward.”} Exerting self-control through distractions has also been presented as a behavioural trait of the cuttlefish. 

Hence, Option B is the correct choice.