I found the passage hard to read but the questions easy to answer.
2. Why does the author mention the ‘Slav Prince’ in the passage?
(A) To provide an example of Rembrandt’s work that does not measure up to his other works
nothing like this is mentioned in the passage(B) To prove that the Slav Prince is a portrait of Rembrandt himself
this might looks like a contender. Yes, the author mentions that he thinks that the Slav Prince contains Rembrandt's face but he doesn't state any prove nor does he want to prove it.(C) To provide an example of a problem he mentions earlier in the passage
This looks good and is supported by the passage: "I invariably experience a shock from the colour standpoint whenever I come in touch with one of his pictures. I was especially struck with that masterpiece". This proves that the color issue is especially present in the mentioned painting.(D) To assert that color printing was the only way to reproduce great works of art such as the Slav Prince
This is wrong for multiple reasons. I don't think this needs to get explained further.(E) To highlight the importance of using the right colors in a painting
It is nowhere mentioned which colors are right or are wrong. It is more about the opinion that colors play an important role in expressing the art of a picture.3. Which of the following can be concluded about the Slav Prince from the information in the
passage?
(A) It is a self portrait of Rembrandt
The author claims that you can see Rembrandt's face in the picture. However, because of a lack of proof this can't be reasonably concluded.(B) It is Rembrandt’s best work ever
This isn't mentioned anywhere and it also is very subjective.(C) No other work of Rembrandt has been reproduced as many times as the Slav Prince
This also isn't mentioned anywhere.(D) The colors of this painting can be improved through color printing
This looks like a contender. The problem is, however, that it is based on the author's claim too. We don't know whether the color really can be improved and hence we can't safely conclude it.(E) It is housed at The Hermitage
This is mentioned in the passage: " I was especially struck with that masterpiece of his at the Hermitage". There is no reason why the author should lie about the location of the painting and hence this is the correct answer.