E super CharSequence makes no sense??

[AbhishekSonu Gupta]

Can anyone explain why Option G is wrong in question given below(Chapter-7 question 14 of SCJP 1.5 book by kathy sierra)..???

Q. Given that String implements java.lang.CharSequence, and:

import java.util.*;
public class LongWordFinder {
  public static void main(String[] args) {
    String[] array = { "123", "12345678", "1", "12", "1234567890"};
    List<String> list = Arrays.asList(array);
    Collection<String> resultList = getLongWords(list);
  }
  // INSERT DECLARATION HERE
  {
    Collection<E> longWords = new ArrayList<E>();
    for (E word : coll)
      if (word.length() > 6) longWords.add(word);
    return longWords;
  }
}

Which declarations could be inserted at // INSERT DECLARATION HERE so that the program
will compile and run? (Choose all that apply.)
A. public static <E extends CharSequence> Collection<? extends CharSequence>
getLongWords(Collection<E> coll)
B. public static <E extends CharSequence> List<E>
getLongWords(Collection<E> coll)
C. public static Collection<E extends CharSequence> getLongWords(Collection<E> coll)
D. public static List<CharSequence>
getLongWords(Collection<CharSequence> coll)
E. public static List<? extends CharSequence>
getLongWords(Collection<? extends CharSequence> coll)
F. static public <E extends CharSequence> Collection<E>
getLongWords(Collection<E> coll)
G. static public <E super CharSequence> Collection<E>
getLongWords(Collection<E> coll)

In Answer explaination it is given that Option G is wrong because
E super CharSequence makes no sense�super could be used in conjunction with a wildcard but not a type variable like E.

[Keith Nagle]

CharSequence is an interface.
Look at F, this answer is the correct version of G.
Looking at the type parameter for G <E super CharSequence>
would imply that you are declaring E as a CharSequence or a
super entity of CharSequence, not something that implements the CharSequence interface. It is an interface, so you
have to have the keyword extends which means a type that "implements" or
"is-a" CharSequence. Read page 593 again.
Best regards

[AbhishekSonu Gupta]

Thanks for your reply...

Tell me one more thing, if we take some other CLASS in place of CharSequence<interface> then would the option G be correct??