The Catholic teaching is that they were capable of handling the situation, but choose willingly to disobey. If they were not capable then then it would be unwilling and they would not be culpable. Catechism 399 “Scripture portrays the tragic consequences of this first disobedience. Adam and Eve immediately lose the grace of original holiness.” In the Genesis 3 the three were found at fault and received consequences for their actions:
14 And the Lord God said to the
serpent:
Because thou hast done this thing, thou art cursed among all cattle, and beasts of the earth: upon thy breast shalt thou go, and earth shalt thou eat all the days of thy life. 15 I will put enmities between thee and the woman, and thy seed and her seed: she shall crush thy head, and thou shalt lie in wait for her heel.
16 To the woman also he said: I will multiply thy sorrows, and thy conceptions: in sorrow shalt thou bring forth children, and thou shalt be under thy husband’s power, and he shall have dominion over thee.
17 And to Adam he said: Because thou hast hearkened to the voice of thy wife, and hast eaten of the tree, whereof I commanded thee that thou shouldst not eat, cursed is the earth in thy work; with labour and toil shalt thou eat thereof all the days of thy life. 18 Thorns and thistles shall it bring forth to thee; and thou shalt eat the herbs of the earth. 19 In the sweat of thy face shalt thou eat bread till thou return to the earth, out of which thou wast taken: for dust thou art, and into dust thou shalt return.