In this task, you need to answer the given multiple-choice question on geometry. Classify your answers into 'a', 'b', 'c', 'd', and 'e'.

Problem: a math teacher has 25 cards , each of which is in the shape of a geometric figure . half of the cards are rectangles , and a third of the cards are rhombuses . if 8 cards are squares , what is the maximum possible number of cards that re circles . 
Options: a ) 8 , b ) 10 , c ) 11 , d ) 12 , e ) 13
a

Problem: find the area of a parallelogram with base 24 cm and height 16 cm . 
Options: a ) 379 , b ) 384 , c ) 345 , d ) 342 , e ) 376
b

Problem: when magnified 1,000 times by an electron microscope , the image of a certain circular piece of tissue has a diameter of 1 centimeter . the actual diameter of the tissue , in centimeters , is 
Options: a ) 0.005 , b ) 0.002 , c ) 0.001 , d ) 0.0005 , e ) 0.0002

c