Both A and R are true and R is the correct explanation of A

Both A and R are true but R is not the correct explanation of A

A is true but R is false

A is false but R is true

lack of ventilation

alternate wet and dry conditions

complete submergence in water

none of the above

greater tensile strength in longer direction

greater tensile strength in shorter direction

same tensile strength in all directions

none of the above

parallel to grains

45° to grains

perpendicular to grains

same in all directions

4% to 6%

10% to 12%

15% to 20%

100%