A mortgaged his residential land to B to secure the loan of P400,000.00 obligation to B. They agreed that A should not sell the land while the obligation exists. Before the maturity of the mortgage, C offered to buy the land from A. Which is correct?

Select one:

a.A can sell the land to C only if B consents in writing

b.A cannot sell the land to C unless A pays the obligation

c.A can sell the land to C despite the agreement not to sell

d.A cannot sell the land to C because of the agreement not to sell