Explanation:

Correct answer: 4. in

To fill in blank No. 3, let's first analyze the context:

The sentence is:

"Portia claims that even if she (1) ______ to live as long as Sibylla, she would die as (2) ______ as Diana because she can only be claimed (3) ______ the manner specified by her father's will."

The phrase "claimed ___ the manner specified by her father's will" suggests a preposition that connects the act of being claimed with how it is done — in this case, according to the manner specified by the father's will.

Now, let’s evaluate the options:

from – This preposition is usually used to indicate origin or source, which doesn’t fit well in this context.

through – This preposition often refers to the process of something happening, but here it's not the best fit to convey "in the manner specified."

at – This preposition typically indicates location or time, but doesn’t quite fit here.

in – Correct. This preposition fits the context well, as it suggests being claimed in accordance with or following the manner specified by the father’s will.