Movement into and out of cells — practice question

What changes take place as amino acids are transported into phloem sieve tubes at a source?

• Awater potential in phloem sieve tubes decreases; volume of sap in phloem sieve tubes decreases
• Bwater potential in phloem sieve tubes decreases; volume of sap in phloem sieve tubes increases
• Cwater potential in phloem sieve tubes increases; volume of sap in phloem sieve tubes decreases
• Dwater potential in phloem sieve tubes increases; volume of sap in phloem sieve tubes increases