Hello!
The correct answers are:
b < 11 is "the board is shorter than 11 cm."
b > 11 is "The box contains more than 11 books."
b < 12 is "there are fewer than 12 beetles in a jar."
b > 12 is "the building is taller than 12 ft."
The reason none of the answers is the last answer, is because the key word "at least" means that the inequality has to be greater than and equal to the other side of the equation.
I hope this helps :))