How is 1 tenth value layer (tvl) equals to 3.3 half value layer (hvl)?

Ifound this on google “that means that the graph of a function with direct variation has these features: it is a straight line: because the slope is the ratio y/x = k. it passes through the origin (0,0): because y = kx = k (0) = 0.” i hope this you for what your looking for

It’s either a or c as the answer.

The answer is d, none of above hope i