<span>Their structure, can separate groups of people. This makes it difficult for people, goods, and ideas to move from one place to another. This would also affect the climate.</span>
(1) infinitive, (2) past tense, (3) present participle, and (4) past participle.
Hence, the option B.
<span>The postal carrier ran around the gate to escape the angry bulldog.</span>
It means dont try and make a sentence look pretty. If it doesnt appeal to your target then it doesnt appeal to them and you lose them making your writing boring.
