On 12 November 1647,
he, and others, were ordered by the House of Commons into safe custody of suspicion of privy to be the king's escape from Hampton Court.
A. he, and others, were ordered by the House of Commons into safe custody of suspicion of privy to be
B. he, with others, was ordered by the House of Commons into safe custody of suspicion of privy to be
C. he, with others, were ordered by the House of Commons into safe custody after suspicion of privy to be
D. he, with others, was ordered by the House of Commons into safe custody upon suspicion of being privy to
E. he, and others, was ordered by the House of Commons into safe custody upon suspicion of being privy to
Split #1: Eliminate all answers with incorrect SV-agreement. If we have "he and others" we need the plural form "were". If we have "he with others" we need the singular form "was". Based on this insight we can eliminate answers C and E.
Split #2: Let's take a look at "suspicion of privy to be the king's escape". Does that make any sense? A person can't be some other person's escape. We find this form in answers A and B so we can eliminate both of them.
This leaves us with answer D as the correct answer.
Hope that helps