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.
--------
Question: Problem: ( ( - 1.9 ) ( 0.6 ) ( 2.6 ) ( 1.2 ) ) / 2.0 = ?
Options: a. - 0.71, b. - 2.13, c. 1.07, d. 1.71, e. 2.71

Answer: b

Question: Problem: a train 100 meters long completely crosses a 300 meters long bridge in 36 seconds. what is the speed of the train is ?
Options: a. 32 kmph, b. 76 kmph, c. 34 kmph, d. 43 kmph, e. 40 kmph

Answer: e

Question: Problem: an employee ' s annual salary was increased $ 5,000. if her new annual salary now equals $ 70,000, what was the percent increase ?
Options: a. 15 %, b. 0.77 %, c. 20 %, d. 22 %, e. 24 %

Answer:
b