How many hydrogen atoms are present in an alkyne with 5 carbon atoms?

acid rain does not usually kill trees directly. instead, it is more likely to weaken the trees by damaging their leaves, limiting the nutrients available to them, or poisoning them with toxic substances slowly released from the soil. the main atmospheric pollutants that affect trees are nitrates and sulphates.

it's c (engineer's do their work with mechanical stuff not on any living being)