A copy of the plan is enclosed and __________ (that/ then/ this) may be communicated to allTeam Leaders for compliance.

In this context, the correct word to fill in the blank is "that." The sentence would read: "A copy of the plan is enclosed and that may be communicated to all Team Leaders for compliance."

Using "that" here serves to refer back to the enclosed plan, indicating what should be communicated to the Team Leaders. The other options, "then" and "this," would not fit grammatically or contextually in this sentence.

Detailed Explanation:

• "That": It acts as a demonstrative pronoun referring to the previously mentioned plan.
• "Then": This word indicates time or sequence but does not fit in this context.
• "This": While it could refer to something nearby or current, it lacks the necessary clarity to effectively specify that it is referring to the enclosed plan.

Thus, "that" is the most appropriate choice.