18) D

We need to calculate the maximum number of cards needed. So we need to use most of the space available on each rectangular card. 

2 ends of the H (2 cm each) can fit in the centre of another H (4 cm each). 

Please draw them out as it will take longer to visualise. 

Soon, you will realise that we can have 6 rows of 3, 2, 3, 2, 3, 2. 


Drawing them out:


             1                                   1                                        1



                              1                                        1



             1                                   1                                        1



                              1                                        1

             1                                   1                                        1



                              1                                        1



This gives us = 3 + 2 + 3 + 2 + 3 + 2 = 5 + 5 + 5 = 15 H shaped cards. 

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