The answer is "C. Both of these".
A signal statement tells individuals that something critical is coming so the audience or reader needs to give careful consideration.
With the end goal to underline the following statement that is an indispensable declaration or point.
From the given statements, both are examples of signal statement.
The statements"keep in mind" signs to the reader that what comes next could be a vital factor.
The second statement "I want you to understand..." likewise signals to the reader or audience that what will pursue is essential for the reader to focus on.
