Movement into and out of cells — practice question

As mucus is secreted by a goblet cell, the following events occur. In what order do these events occur?

• A$1 \rightarrow 4 \rightarrow 2 \rightarrow 3$
• B$1 \rightarrow 4 \rightarrow 3 \rightarrow 2$
• C$4 \rightarrow 1 \rightarrow 2 \rightarrow 3$
• D$4 \rightarrow 1 \rightarrow 3 \rightarrow 2$