Select the most appropriate option that can substitute the highlighted segment in the given sentence. If there is no need to substitute it, select ‘No substitution required’.
It is easier to learn English than to learn German.

Correct option is B

No substitution required The original sentence is grammatically correct and clearly compares the relative difficulty of learning two languages with parallel structure. There is no need for substitution as the sentence is clear and correctly structured. Grammatical rule used: Comparative structures often use "than" to compare two elements, maintaining parallelism in the verb forms for clarity and coherence. Example: It is more comfortable to drive a car than to ride a bike.