Update field with the longest varchar field
Using the MAX function you could write the following to obtain the entry with the longest varchar
SELECT 
  MAX(LEN(options))
FROM 
  ForrasReportsRicsiTeszt;

This can then be combined with an UPDATE statement to give
UPDATE ForrasReportsRicsiTeszt
SET
   options = REPLICATE(options, 4)
WHERE
   LEN(options) = (  SELECT 
                     MAX(LEN(options))
                   FROM 
                    ForrasReportsRicsiTeszt
               );

Alternatively you could use a Common Table Expression (CTE).
;WITH MyTestCTE ( LengthLogngestOption)
AS (
    SELECT 
      MAX(LEN(options))
    FROM 
      ForrasReportsRicsiTeszt
   )
UPDATE FRRT
   SET FRRT.Options = REPLICATE(options,4)
FROM
   ForrasReportsRicsiTeszt FRRT
JOIN
   MyTestCTE MTCTE
ON
LEN(FRRT.OPTIONS) = MTCTE.LengthLogngestOption;