the thickness of the line of a letter whith 14mm height in B type lettering is

[Anonymous]

1 mm
1.5 mm
1.25 mm
2 mm

[Anonymous]

2

[Anonymous]

1.5

[Anonymous]

1mm

[Kent1Cooper]

For an actual source, rather than just people's personal opinions, see the Wikipedia article about technical lettering.  It says [down near the bottom] that the line thickness for B-type lettering should be 1/10 of the height, which would mean that none of your options is correct, but the answer should be 1.4 mm.