Task: Question Answering
Input (English): Problem: if the ratio of the sum of the first 6 terms of a g. p. to the sum of the first 3 terms of the g. p. is 343, what is the common ratio of the g. p ?
Options: a. 3, b. 1 / 3, c. 2, d. 7, e. 1 / 7
Output (English): d