Given a math problem with context and a question and 5 answer choices, the task is to provide the correct answer choice based on the problem. You must choose one of the given answer choices by letter: a, b, c, d, or e; anything else is invalid.

Problem: the least number which when divided by 5, 6, 7 and 8 leaves a remainder 3, but when divided by 9 leaves no remainder, is :
Options: a. 2377, b. 1683, c. 2677, d. 9972, e. 1611
b

Problem: a rope of which a calf is tied is increased from 12 m to 23 m, how much additional grassy ground shall it graze ?
Options: a. 2989, b. 2789, c. 1210, d. 1288, e. 1211
c

Problem: a welder received an order to make a 1 million liter cube - shaped tank. if he has only 4 x 2 meter sheets of metal that can be cut, how many metal sheets will be required for this order y ? ( 1 cubic meter = 1000 liters )
Options: a. 92, b. 90, c. 82, d. 78, e. 75
e