B, all others dont really make sense in the context.
This poem A Heritage of Trees is not a ryhming poem. There is no ryhme scheme. The lines are short and there is no metre. No line has a set number of beats. Compare this poem with some of the ryhming poems in this site. Note that in poetry some words can be left out : e.g. Attack a tree today (on) the road from Mysore to Ooty.
source: english-for-students.com
p.s. hope this helps
<span>These and those do not work at all with singular nouns, like "these dog." The adjectives can equally be used with "these things", "those ones" or "these dogs". "these ones here" or "those long-haired young labrador puppies" are ok too, so they're not limited to concrete or simple subjects. The subject is always plural, therefore B is the best answer.</span>
As someone who writes books, I'd normally use quotation marks, and the person is obviously talking, so the first one should be correct.