A) someday, but only if leading members, including Singapore, Indonesia, and Thailand, were to place pressure
- creates meaning error. Usage of "were" makes it sound as a hypothetical condition/situation, instead it is a requirement which needs to be fulfilled. Hence, eliminate.
B) someday, but only if pressure from leading members, including Singapore, Indonesia, and Thailand, is placed - ok, but could have a better structure and arrangements
C) someday only if leading members, including Singapore, Indonesia, and Thailand, would place pressure - use of "would" is actually unnecessary. Hold and move.
D) someday only if leading members, which includes Singapore, Indonesia, and Thailand, were placing pressure - incorrect use of past continuous tense. Eliminate.
E) someday only if leading members, including Singapore, Indonesia, and Thailand, place pressure - present tense, concise, no meaning error.
Compare E, C and B. E stands out to be the best option.
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