Which of the following sentences is correct?a. The greater the number of independent variables measured, the easier it is to interpret higher-order interactions.b. The greater the number of independent variables measured, the more difficult it is to interpret higher-order interactions.c. The greater the number of independent variables measured, the more difficult it is to interpret the lowest-order interaction(s).d. The greater the number of independent variables measured, the easier it is to interpret the lowest-order interaction(s)