Final answer:
The statement s1.equalsIgnoreCase(s4) can be replicated with the method s1.regionMatches(true, 0, s4, 0, s4.length()), which compares two strings for equality, ignoring case, from the start of each string for a region length of s4.length().
Step-by-step explanation:
The statement s1.equalsIgnoreCase(s4) is used to compare two strings for equality, ignoring case considerations. The most equivalent method call that achieves the same result is s1.regionMatches(true, 0, s4, 0, s4.length()). This implies that the two strings should be compared in a case-insensitive manner starting from the first character of each string and comparing characters up to the length of the second string (s4.length()).
The correct statement that is equivalent to s1.equalsIgnoreCase(s4) is not provided explicitly in the given options. However, the closest one is s1.regionMatches(true, 0, s4, 0, s4.length()), which implies that there is a missing argument in the provided options, likely the length of the region to be matched, which should be s4.length().