Only A makes good grammatical and semantic sense. I presume that BTLT means 'big thing, little thing': "If you DOUBLE the length of something, its surface area and cross section go up FOUR times, while its volume and weight go up EIGHT times.
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Mister MicawberI presume that BTLT means 'big thing, little thing': "If you DOUBLE the length of something, its surface area and cross section go up FOUR times, while its volume and weight go up EIGHT times.You're right! BTLT means Big Thing, Little Thing. In the webpage with the address below, I saw the sentence in question.
Gu-Hoon KwonCould you please explain the grammatical structure and meaning of the sentence (The BTLT rule makes some things quite impossible for bodies to do or be!)The structure is self-evident; the meaning of (A) is that 'the laws of physics restrict animal body design.'