Which of the following is the correct network diagram for the table?

Question

Options

• ABegin - A - C - D - E - End - B - D
• BBegin - A - B - C - D - E - End
• CBegin - A - B - D - E - End A - C - D
• DBegin - A - C - D - E - End - B - C

• A
  71% (25)
• B
  9% (3)
• C
  17% (6)
• D
  3% (1)

Explanation

Option A correctly represents the network by showing two distinct paths: the main path (Begin → A → C → D → E → End) and a parallel branch where B feeds directly into D, matching the predecessor relationships defined in the table. This structure captures that B is an independent activity that merges into the network at D, not earlier.

Why the distractors fail:

• B is wrong because it forces all activities into a single sequential chain (A → B → C → D → E), ignoring that B runs in parallel and is not a predecessor of C.
• C is wrong because it incorrectly shows A splitting into both B and C as successors, misrepresenting A's role in the precedence table.
• D is wrong because it connects B into C rather than D, placing B's output at the wrong merge point in the network.

Memory tip: In network diagrams, look for where each activity merges back into the main path. The key question is: which node does the parallel branch feed into? Trace the predecessors of D - if the table shows B is a predecessor of D (not C), then B must connect directly to D, which only Option A captures correctly.

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