Select the most appropriate option that can substitute the underlined segment in the given sentence. If there is no need to substitute it, select ‘No substitution required’.
Applications are to be sent to the school’s e-mail ID before 30th June.

The correct answer is No substitution required.

Explanation:

The sentence is: "Applications are to be sent to the school’s e-mail ID before 30th June."

1. The subject of the clause is "Applications" (plural noun).

2. The structure "are to be + past participle" (are to be sent) is grammatically correct and expresses an instruction, arrangement, or requirement in the passive voice.

3. Let's analyze the given options:

- would be send to: Incorrect because the passive construction requires the past participle form of the verb ("sent"), not the base form ("send").

- is sending: Incorrect because "Applications" is a plural subject (requiring "are", not "is") and the active continuous form does not fit the passive meaning (applications do not send, they are sent).

- will be send to: Incorrect because it uses the base form "send" instead of the past participle "sent".

Therefore, the original underlined segment is entirely correct, and no substitution is required.