**CONCEPT: **The question tests on the application of techniques in proportion and ratios.

**SOLUTION: **

__Refer to the figure attached.__

Convert the ratios of the first alloy into 4:6:2 so that the quantities of the alloys are made equal(12 units each).

Thus weight of lead = 3/(12+12) = 3/24 =1/8 kg

**(OPTION B)**