First you know you'll divide by -2, so the sign will be flipped.
That eliminates the first and second options, then you'll just have to do math.
Presumably, ln⁵(<em>x</em>) is the same as (ln(<em>x</em>))⁵ (as opposed to a quintuply-nested logarithm, log(log(log(log(log(<em>x</em>)))))).
Then substituting <em>u</em> = ln(<em>x</em>) and d<em>u</em> = d<em>x</em>/<em>x</em> gives
Answer:
the answer would be 0.372
I thin there are in 48 in 3 gallons