Select the most appropriate option that can substitute the highlighted words in the given sentence.
He who has suffered most in the cause let him speak.

Correct option is A

The correct substitution of the highlighted words is (a) should speak.
Explanation: The original sentence lacks proper structure. "He who has suffered most in the cause" is a conditional clause and must be followed by an appropriate suggestion like should speak.
Grammatical rule used:
�� When giving a suggestion or recommendation, use "should" + base verb.
Example: Anyone who disagrees should speak now.
�� Information Booster: Avoid imperatives in complex conditional structures.