Answer:
B- Dependent clause
Explanation: An example : 'My father is reading a book because my mother is sleeping.' 'My father is reading a book' is an independent clause and could be a sentence on its own. 'Because my mother is sleeping' is dependent and makes no sense without its independent counterpart. Dependent clauses often don't make sense on their own.
For the first one i'd say the answer is C
and for the second one i'd say the answer is C
because, it is easier to use plants or things of that type other than using human trials which can be lethal if done wrong.
