Lines 7–8, “’Twere profanation of our joys / To tell the laity our love,” mean — a.
our love is profane but confessing it would absolve us
b.
we are the only happy people in a society of miserable souls
c.
our love is so sacred that we should not speak of it to others
d.
mere physical love is very different from true spiritual love

c.  our love is so sacred that we should not speak of it to others

Explanation:

In the poem, ''A Valediction: Forbidding Mourning'', the speaker and his lover seem to be parting ways seemingly temporarily and he tells her that it would be best if the do not cry too much or noise about it.

He believes that doing such things would desecrate the love that they have for each other which would be wrong because it is simply too sacred to let others know.

a.) it provides a clue to solve the mystery.